While I do understand this reasoning, I have to wonder if Alolan Golem wouldn't be a viable alternative as well.
1) It has an easier time vs Kingambit since it takes even less damage from Kingambit than Probopass does with similar investment (albeit only ~1-2% less) and won't insta-die to Low Kick variants, letting you get at least some solid chip on them even if they Tera on you while handily wiping out any Kingambits that don't Tera.
2) The Heatran matchup is admittedly shakier, but Alolem can survive Earth Power under the same conditions as Probopass does, and Earthquake puts Heatran in a much more manageable threshold than Probopass's Body Press or even Earth Power ever would, if not OHKO the Tran outright. Of course, you could just still Body Press the Heatran to death with enough damage reducing modifiers, much like Probopass does now, but you probably might want a slight bit of SpDef investment to not be at risk of Earth Power high roll 2HKOes or something.
3) Alolem's actually usable Attack stat leaves it a lot more room to fit in more impactful tech options, such as the aforementioned Earthquake as well as other tools like Supercell Slam to try and wear down Skarm or perhaps more notably EXPLOSION to try and gain momentum on switch-ins like Lando-T and Tusk into setup opportunities or just simply dish out a not insignificant chunk of damage into matchups where trapping is otherwise useless in.
4) Alolem can also alleviate the team's vulnerability to Fire to a certain extent; I feel you probably need Iron Defense alongside Body Press if you want this thing to actually stand up to Gouging though.
