Finally got around to this. Replaced the broken black key. But noticed a tab was also busted off the neighboring white key. Ordered that.
I didn’t video the disassembly, but I’ll try to remember to video the white key replacement and the re-assembly for the record … once the white key arrives!
I found a c50 video online, and other model key replacement videos. The assembly and key install are not exactly the same, but I was able to figure them out enough. Hope it works when I re-assemble ;- )