Hey mate, I know a guy that can repair pretty much any wheel, but he is up here in Scotland. If you struggle to find anywhere locally you could always post stuff up to him, tell him I gave you his number (01555841000 - Derek @ Ace Performance Cars), and see what he sais, he should be able to see you right. He sorts stuff you wouldn't even think repairable from damaged split rims to completely broken rally rims, and can powder coat etc.
;-)
Phin