I'm not sure if this should or shouldn't work, just one option that I've been trying. I've ticked the "Prefer egpu" option of Parallels Desktop 16, Parallels Tools installed, I'm trying some Windows updates to see if that improves things, I understand that there are no specific drivers to install as Parallels manages graphics (since v15) through Metal. Allocated 5 cores and 24gb system memory to the VM. I haven't found many other things to change that might make a difference here. It loads up ok, looks fine in orbit, however, character models are all messed up, like some sort of registration point is missing, all a moot point I'm sure. I've read a few things about Parallels and gaming and I thought I would give this a shot as I've had no luck with the bootcamp + egpu approach so far. Thanks!
