I cannot remember where I seen this so what comes next may not be helpful but..........
You can get something that allows you to extent your steerer tube, similar to a quill stem converter, but that is strong enough to act as steerer tube for when the headtube of a frame is too long. The device comprises a tube that is the diameter of a 1&1/8th inch steerer tubes internal diameter. An expander bolt secures it in place and external shims bring it up to the external diameter, result a longer steerer tube.
All I can suggest is try google and ebay, they do exist and should solve the steerers length problem.
Cheers