Also, when you cost yourself 15,000 xp you can fix it. Hex editing datafiles is lame, but I think I'm justified. Tuxnes doesn't seem to have a save-state described in the help dump.
So after fixing that, I went back to what I was doing when I was trying to die to save: Get to 7-6-7, then finish palaces 4 through 1 in reverse order (I had killed the bosses in 1-3 but not turned in the gem). This way I ended up getting almost 8000xp for turning in the gem in palace 1... it was self-satisfying.