Well chaps... where there is a will, there is a way.
Ryzen 9 3900 (non-X) - ORDERED
I did have to take a motherboard with it (so I made sure I picked a half decent model that people are after).
The plan is to flip the motherboard and the 3500X and re-coup some cash.
Would it have not been better to get a 3900x at the start and save all the faff?