well i'm gonna stick by my guns and say try it, don't sell the fry though. oh, and take pictures; i'm really curious to see a jag dempsey.. or jackguense?
And quick hint gents, WWII anti Semitic insults... not the way to make friends.
Either way, I wouldn't personally risk the JD, i imagine it getting a real shoeing from the Jag. Just dont sell the fry if it does work, use them as feeders, keep a few if your into hybrids, but i wouldn't want them getting into the mainstream and cause further confusion.