Just get a custom thicker than normal head gasket made up. One mechanic I know says he has done it a couple of times with BMW's that has over skimmed or skimmed to max cylinder heads. He got gaskets then made up that are 1mm thicker than normal. His max so far is 3mm thicker than normal and the car is still running without blowing gasket. My brain is on the other hand telling me that it might blow head gasket easier in a turbo application where pressures are bigger.