The original looks like it's a pretty spindly prop to begin with, all things considered. You'll probably want to treat it with kid gloves no matter what, so that extra chunk being taken out shouldn't hurt it.
For that tip, I think you are probably best off casting it in a clear resin, unless you know a vacuum forming expert. casting a smaller simple shaped part like that isn't all that expensive or difficult. You'd end up making an original out of wood, or on a 3D printer, or just out of different shaped things you'd glue together, make a latex mold of that, then pour your clear resin into it. There's lots of good resin casting stuff here on the forums. It's surprisingly affordable.