Isnt all that renault 5 turbo stuff up for sale in buy and sell? it sounds like a good project but i guess its not been successful as yet.
Also some K10's came with straight turbos. the engine codes are MA10ET, usually found in Figaro's (they have auto gearboxes though). I've seen some pop up on Yahoo Auctions in Japan!
Like most things micra though, things like turbo kits, bodykits etc! just aren't commercially available!