Talon, you are on the right track with the arbor press, I got one from work for $5 took the press shaft and drilled in the bottom center to fit a die then drilled in from the side taped threads and added a detente screw to hold the die in
place, for the bottom I drilled a hole in the plate that was on the press then took a 1" shaft cut to length welded a collar on the shaft and drilled a hole in the center top to set the die in, I also take the dies out and use it to press my makers stamp in.
This has made both operations much easier, the snap set much titer and neater then hand pounding them.
good luck
Tom