Well, I think I've gotten everything set up and it seems to work in the most part!
Project Cars 2 with my Fanatec pedals and T500RS wheel works great. I get the same performance as before (overclocked Ryzen 1600, 16GB) and my wheel and pedals are found and work without an issue which I'm extremely happy about as this is my primary game.
Apex Legends is a bit hit and miss, I seem to get rubbish performance compared to Project Cars 2 and I'm not really sure why. Perhaps driver related?
Setting everything up was fairly simple. Uninstalled all AMD drivers in safe mode in Windows and installed the latest AMD drivers from the Bootcamp website.
My Vega 64 was found perfectly