The last frankenwheel I built was a 24h low flange hub on a 36h GP-4 that got three X on the drive side and radial on the non-drive. 12 new spoke holes drilled into the hub on the drive side, and all was good. Trying to fight a battle with not enough holes on either the hub or rim is not my kind of fun! And they are likely doomed to failure, so I don't even consider it. If you wind up doing what Bob says you will need to do differential spoke length calculations,which are time consuming and tedious even with computer generated programs. Pain in the Posterior is exactly right. Smiles, MH