As an SS OU player who dips from time to time in Pet Mods, I'll give some thoughts on this slate. The long short of my thoughts, though, is that I share a lot of sentiments with
G-Luke.
+Magic Bounce
Magic Bounce feels like optically a very strange ability for Swampert to have, especially from a flavor standpoint. In the SS OU metagame, Swampert's primary niche is to be a bulky, Stealth Rock-setting, pivoting Ground-type with an added Magma Storm resistance and the ability to more reliably take on Hail, however Swampert's issue is more that it is entirely and completely outclassed by Landorus-T as a Ground-type pivot due to its lack of a practical ability that complements its niche and, most prominently, its lack of a Ground-type immunity. Discussing the slate at hand, Magic Bounce gives Swampert a Toxic immunity which is probably the big thing of note, but in the grand scheme of things it's going to still get overwhelmed by U-turn spam, and it especially loathes Knock Off stripping it of Leftovers recovery. I personally feel as though Regenerator would be a more thematically fitting ability (considering Swampert is based on an axolotl), as well as one that better bolsters Swampert's existing niche in the SS OU metagame. Regenerator would help boost Swampert's longevity and play better to its niche as a bulky Ground-type pivot that would fit comfortably on Bulky Offense structures.

+Spikes
This suggestion is interesting, and one that I could see being really cool especially in tandem with Defiant and considering the metagame has literally 0 viable offensive Spikers, but as cool as it is I don't really think it will do too much for it. To me, what really makes these Pokemon really struggle is their general inability to get in reliably throughout a game, as well as their reliance on weather to break Ground-types. Of the given suggestions though it feels at least the most dynamic considering how these Pokemon interact with Corviknight and Ground-types in general, and it adds an extra layer to their playstyle that could also further cement their niche as offensive Electric-types, so I'm ok with it.
+Hurricane, +No Guard
I get why this was suggested, but this is definitely a case where I hugely dislike the idea mostly because of optics. If you want to give Rotom-Fan the option for a new ability, I think it's important to provide that same set of options for the other appliances as well, even if they may ultimately prefer Levitate. I'm definitely ok with Hurricane > Air Slash though, especially considering Rotom-Fan lacks in immediate power. Nasty Plot + Electric-STAB + Hurricane sounds really nasty in its own right, even without No Guard, but this is another case where the suggestion doesn't really help Rotom-Fan's core problems that block it from being a consistent presence. Defensively it's going to be lacking a lot and boasts very similar problems to Rotom-Heat since it is reliant on Pain Split for longevity and is prone to Knock Off from threats like Tornadus-T, which it may often attempt to pivot into and of which can gimp it further by exposing its Stealth Rock weakness. Rotom-Wash makes up for these issues with its extremely premium defensive profile, Stealth Rock neutrality, and incredibly potent secondary STAB which lets it outright beat Ground-types, but Rotom-Fan I think is going to always really be behind just by nature of its competition and its defensive shortcomings. In short, I don't really think this is an avenue worth sinking time into since it will likely take some serious, fundamental revisions that would, in my opinion, also require investment in the other appliances for optical consistency and create a messy web of balance decisions.
+Healing Wish
This suggestion feels the most fun and practical to me, and is probably the one I would vote on personally. The main reason I like this idea is because it actively plays to the Sticky Web archetype's inherently volatile, sacrificial style and actually improves it, which in my opinion is notable considering how all-in of a playstyle it is and how it often makes very undesirable trades otherwise. Healing Wish on paper seems to do several things. For one, it gives a second wind to a Pokemon that may have otherwise been saved as death fodder and in essence adds an extra key breaker to the team. Healing Wish, however, also does something else very important, which is that it completely blocks Defog. This is monumental because Defog is, otherwise, technically unblockable for standard Sticky Web structures, even with Defiant to deter it. If you are even marginally incorrect in your positioning to where you cannot immediately punish Defog attempts, you can lose the hazard instantly. Considering how potent Corviknight is as a removal option, this is arguably even more pertinent. Healing Wish on Ribombee is flavorfully sound, and Ribombee specifically being such a fast Sticky Web user makes it a perfect candidate, though it lacking Stealth Rock does still make it probably inferior to Shuckle, but Healing Wish and Ribombee's incredible Speed tier may surge it to superiority. While this suggestion is a lot of fun mostly because it feels very in-tune with the playstyle and actively buffs its gameplan, this does nothing against Heavy-Duty Boots spam which is another gigantic weakness of the playstyle nowadays and is probably in my eyes the greatest reason Sticky Web has fallen off so hard. The tricky thing is that there's very little you can do there unless you have some sort of auto-Magic Room ability or something, so this feels like a reasonable step even if I don't think it will surge the playstyle to consistency.