Fujimo,
well, maybe not wasted. How about just using them for shooting small game. Get some glue on judo's and glue them onto full length aluminum or steel adaptors. That should give you a little extra length for clearance.
Or, instead of using screw in adaptors and some sort of insert, getcha some of those brass inserts that are the insert and adaptor all in one, and still use the judos.
If you use large 5.5" fletching you can get away with a lot of non-tuning issues, and just enjoy them for what they are.... a learning experience and bunny arrows !
chuckC