Ayy, we did it. Thanks everybody! Stopped by my FFL to pick up a long gun and they took a look at it. They unscrewed the pin, but it still wouldn't come out of the die, so after clamping it into a vise and working it over with a wrench, they were able to torque it out.
Decapping pin is hella fucked, but I use the Frankford Arsenal hand deprimer, so I don't really care and I can still resize with the die. First 100 rounds came out pretty good!