I know this is replying to a dead thread, I'm just doing this for anyone who comes across this and wants a non-destructive method. A dremel or pipe cutter is going to cause unnecessary damage to either the tip, the blade, or both since they can be somewhat thick for such small parts. My method has been very reliable.
This will work, unless they literally fused the pieces together (lol)
If I need to remove one of my tips during a conversion: I take an exacto blade and line it up to where the tip and the blade meet. I kinda seesaw it until it starts to go in between the tip and blade. Once it bit into it slightly, I take a hammer and, with little to moderate force, hit the exacto blade until it goes in just a little further. You don't want to go in too far or you'l cut into the core of the tip, though it's not the end of the world if you do - the tip is all one piece. After, I remove the exacto blade from where it was, then rotate the blade - rinse and repeat. I do this until I've made four cuts into the adhesive. After that, I can usually take a thin flat head screw driver and pry up. I pry up a little on each side so as to not warp anything. Done this several times and you'd never know, and the tips still adhere just like day one.