That's how I cut off the lead bait keeper so I can tie on a wire one.
I just use the gate shears that I bought when I got my molds. I cut around the the top, give it a rotate, then cut across the top of the piece to pull the whole thing off. I just make sure I don't use enough pressure to nick the hook wire (not that I think it would really matter).
When I'm putting on the wire keepers I put down a layer of thread, then a light coat of Sally Hansen's Hard as nails, then wrap the wire keeper on, a couple half hitches and then a coat of Sally Hansen's.
Andy