Yes, you can use heat to reverse the bond on epoxy. If you want to remove an insert from a broadhead that has been glued up using JB Weld, apply the heat to the insert, NOT the broadhead! If you heat the broadhead enough to get it loose you will ruin the temper. The cleanup with old epoxy is definitely more trouble than with hotmelt, but not that bad. With epoxy you will have plenty of time to get the broadhead aligned for straightness, and I don't care about indexing them, so epoxy is usually my first choice, especially JB Weld or a slow cure marine epoxy. Mostly I just buy the screw-in broadheads and don't have to worry about gluing in the inserts. I'm just lazy I guess.
Allan