Guys, I just don't see this working.
By my weak old eyeballs, it looks like the thickness of the bars in the Cherry cross-arms is about 1mm, and the cross itself is about 3.5mm wide.
In contrast, the bars in this are a good 1.5mm wide, and the whole thing is nearly 5mm across.
Last, it appears that the stem is intended to go deeper into the keycap, while the Cherry stem protrudes only a couple of mm.
If I did not have any other projects, and if I wasn't a Model F man anyway, I might happily go to the effort of excavating and re-building these things. But I may never get around to it.
These are really pretty caps, somewhat discolored (nothing that a good cleaning or Retro-brite wouldn't fix) but uniformly and not unpleasantly.
Somebody make me an offer on them, but I need the money so I can't just give them away.