Right, I concur with your “analysis”….
My opinion is that the two studs will be smaller than the bolt holes, and without clamping force on the housing from the two (original) bolts, they are unlikely to provide any support vs. the rotational force, unless the outer bolts / holes on the bellhousing yield enough that the two inner studs press against their respective hole walls.
But that’s just my WAG (Wild Ass Guess).
It all depends on overall transaxle alignment, and bolt hole tolerances.
I’m running without the bolts installed, with studs. Never had to pull the transaxle yet, though.