I didn't understand the bit about wing modifications unless they mean an entirely new Mod to reinforce the wings as opposed to a re-spar or repair.
The engines would appear to be the stopper though. Their mtbf was very low in the 60s and compared with a modern fan they are the equivalent of the Bleriot. If it could be fixed for £200k, so be it.
To say they have run out of engines, how many installed power plants are there in museums around the world?
The Panton brothers discovered that their merlins were perfectly serviceable, so maybe they could find some 201s n museums and do a swappsey.