[Christ]

Ok, I see what you're saying about stability now, and that's correct, because you gain stability by putting cG ahead of cP, iirc.

HOWEVER! There is always a caveat, right?

In the M/R arrangement, the weight is almost always still biased to the front, if not equal (rare, once you add driver/passenger/stuff), and a good amount of under steer can be dialed just by tuning the dynamic alignment of the wheels while turning.

Adjusting brake dive via the stiffness/compensation of the front suspension to compression can also lead to over/under steer, whichever way you take it.

Clearly, there is more to the meal, so to speak, than weight distribution, eh?

Parts swapping: the M/R layout is typically transverse, like a F/F layout, except in the middle of the car, and without steerable knuckles on the drive wheels. Swapping should be pretty straightforward, except for space/packaging concerns.