Music wire is carbon steel wire. It'll work fine, but with a couple of notes.
It is not stainless, not usually a problem but something to know.
It is pretty hard stuff, and if you use a grinder to grind it flush with the handle, it'll get real hot. Hot enough to melt any epoxy you used. Best thing to use, is clip it close as you can or use a hacksaw or bandsaw, and work it down with files and sandpaper. If you are relying on a grinder, it'll get hotter than a firecracker.
I made mosaic pins with music wire inside. Cool looking. Throws showers of sparks when ground with fast grinder. Then too hot, melts epoxy, mosaic pins come apart. Not good.
So, I work them down by hand.
No big deal, I work the handles down by hand (files and sandpaper) now. Except for really roughing it out.
Dan