Hey Tony,
If it's not too late...I don't know all about the compatibility issues with Nikons and the various lenses, but if the body is a problem, could you not simply keep your favourite Nikon lenses and ditch the body for a simpler one?

The only reason I say this is because although I have very limited experience, I've already found out that RFs are great for some things, and SLRs are great for others. They're just different tools for different purposes. If you go out and sell all of your Nikon kit it is reasonable to expect that at some future date you will miss it either for personal or professional reasons...And you will certainly pay more to replace it than you will make in selling it.

Just a thought,
Kent