I've already tried that. In fact, Peewee already HAS a SW_DEAD, and it's 50. So, I tried assigning the launch star a SW_APPEAR of 50 as well, and it doesn't appear after I defeat the boss.
EDIT: Dolphin also gives me errors every time I spin at Peewee, except the first time. It doesn't crash, but it does give me an error. Haven't tested this on console.
seriously im gonna make a smg2 hack that makes the game beatable 0x a presses, just you wait