You can get manifold adapter plates made up in England. You just have to send them a gasket from each manifold and they can build you one then.

Driftmotion can rebuild your standard turbo core with a steel wheel for €500, and it's supposed to be good for 450bhp. You have to send them your turbo obviously, so God knows how long you'd be waiting for your turbo to arrive back here. Surely somebody in Ireland can do the same thing????