That much piston above the top of the cylinder is not going to work. The head gaskets are designed to be between a flat surfaces and not another gasket. If you want to pursue make a 1.3MM solid copper cylinder base gasket. Back in the late 70's when alcohol fuels first hit the scene, I was riding a Moto Guzzi Sport and tried two head gaskets to reduce the compression to something that the alcohol/gasoline fuel could tolerate without knocking like a forge hammer. The stack of gaskets just would not hold a seal long.