Eh, you're probably right. He'd appreciate the extra coverage move anyways. After a Swords Dance, Rock Slide OHKOs Gyarados, Dragonite, and Salamence (with Intimidate) w/out Stealth Rock. You still have to watch out for Scarf Flygon, but especially Scarf Garchomp, who can switch into Fire Punch / Swords Dance / Rock Slide and force you out or OHKO. It's still risky though, as unboosted Hi Jump Kick does 83.2% - 98.3%. Burunkeru (new Water/Ghost) is a pretty neat check. It is immune to Fighting and resists Fire, only taking neutral from Rock Slide. It has Boiling Water or Surf to kill off Blaziken, and Speed Boost Blaziken cannot have ThunderPunch. Shadow Claw could be a problem, but Burunkeru is really it's only use because +2 Hi Jump Kick does 94.8% - 111.9% to 112 / 0 Latias.I dunno blasphemy, Sub + LO sucks at the best of times and Blaziken -needs- Life Orb (one could argue he is one of the best users of Life Orb on the entire game). And I also think Blaziken forces enough switches for Sub/Protect to be a mostly wasted moveslot. This isn't Ninjask we're talking about here.
I still say the set I posted in the OP is gonna be the standard once people realise there are far better late game sweepers than SDBlaziken. Unfortunately I've since realised that Stone Edge isn't a TM and will most likely be illegal with Speed Boost so looks like Rock Slide gets the nod. It's a big drop in power but the flinch rate has good synergy with Speed Boost.
EDIT: Even if Stone Edge is still a TM, I'd prefer Rock Slide on something as powerful and frail as Blaziken, considering it gets all the necessary KO's.