That’s still not aircraft-like, because the nacelles can’t be rotated fully horizontally. Actually, it’s not really helicopter-like either.
Apparently there are some situations where the two rotors don’t receive the same power. If I recall, one of the engines may have been surging, though I don’t recall the specific report or the details. In any case, it’s more than just a simple driveshaft connecting the two engines/rotors, and it especially can’t fail while in helicopter mode.
I should have been more specific that I was referring to dynamic stability, where once that mass starts to roll in one direction, it wants to continue rolling in that direction rather than returning back to wings-level. As you stated, that inertia has a resistance to change, so it will take more effort to roll back to wings level.