After looking at P3Dv5 threads here, I wasn't too hopeful - but, encouraged by Reshade's performance in XP11 I though I'd have nothing to lose. After all, it doesn't mess with any core P3D files ...
I hadn't dared to even try Reshadewith vanilla P3Dv5 or with HF1. Imagine my amazement to find that
IT WORKS!!!!
This is Reshade
v478.0.846 (latest as of posting) and
P3Dv5 with Hotfix2. Select DX12 when running the Reshade installer.
To early to say if there are any "gotchas" as yet ... but all *appears* to be fine so far.
Congrats and many thanks to everyone that's made this possible.
Adam.