If you use a very small drill bit you could probably remove the heads from the tank badges and then get the rest of the screw with vice grips.
I'm betting those wee counter sunk screws are very hard to get too!
Nah it's that flash swirly striped decal I want to put back on, I think they are stick on ones and I have seen them on Ebay for sale but only in the states so that usually means out of my reach.
I've got a trick car painter in the extended family who says he can reproduce anything so maybe he might get the job.