anybody tried this yet?
i imagine it can be done with super glue and some epoxy/fiberglass mesh/metal plate reinforcement. but space in that part of the pistol grip is pretty tight so the reinforcement approach might not be viable.
unless, of course, alloy welding mats are available locally.

other option to buying (an almost impossible task, methinks) is to have a copy done by a machine shop.
but, who knows, somebody might be willing to part with a spare motor cage from a broken mek.