Mulling over a potential Pioneer key repair approach

[Katie Wasserman]

I've never tried that but I can't imagine that it would work. The entire hinged key section is a single molded piece that offers no obvious way to section it without it falling apart.

I think you have a much better chance of trying to fix the few keys that are broken by melting into the remaining plastic a small, thin, flexible piece of metal to serve as the hinge.