I got a fiber rear sight for my old .45 Win Mag Contender barrel and wanted to add a fiber front sight. The front sight was soldered on. I didn't want to unsolder, so i filed it down, drilled two holes in it, and mounted a piece of fiber with steel wire. After a bit of touch up, it doesn't look bad, and shoots just fine. I know this wasn't what you were asking for, but I thought I would at least give you a possible.
mike