Good idea, but like others here, I'm not sure if I want my broadheads on so permanently.
A long time ago a broadhead I had used hot melt to attach came off in my bow quiver (and wouldn't you know it, it just happened to be the arrow I had just slipped out to shoot the big bear that was a VERY few yards in front of me, LOL!).
Since then, like Jon, I make sure that everything is super clean before attempting a bond with hot melt.
I start by scrubbing the inside of the point/broadhead well with a brush used for cleaning the inside of a gun barrel and acetone, then wipe completely clean (using more acetone with the piece of cloth if necessary).
Then, I also wipe the taper of the arrow lightly once with acetone.
I have never had a problem since.