First … I share your frustration that driver version rollback is always such a nightmare.
Second … I can not help as I also do not have a solution
(maybe a little off topic:)
but … I would like to know more about your DX12 trouble.
I did switch to DX12beta because it does a least fix the tile chaos … even when then I get the new (related) “missing airport tile overlay” bug. But this is visually way less disturbing.
I do get (very) frequent CTD even when loading into the new departure location. This is somewhat random as repeated attempts for exactly the same airport and departure spot (ramp, gate) sometimes work … and sometimes crash.
So I suspect there is a DX12 specific “initial 3D asset loading CTD” bug … perhaps due to a race condition somewhere in the code or the driver.
But besides that I have not seen CTD crashes during the rest of the flight.
So … any further info on your DX12 CTD issue would be interesting (e.g. perhaps a pointer to a DX12 forum thread related to your issues)
… I already described my CTD issue here: