There was a Linus tech tips video a while back about a new run of copycat Model M keyboards using some combination old tooling and new techniques (I don’t remember the specifics at the moment). Are you familiar with those boards at all?
IBM sold off their keyboard division to Lexmark, and eventually Lexmark decided to stop doing keyboards, so two Lexmark employees bought the tooling to make the very last model of the "Lexmark Model M" and still make them to this day under the Unicomp brand.