On the Alps versions, everyone should note that at the moment keycaps harvested from old Alps boards mostly won’t work for stabilized keys, because the stabilizers are different.
(Certain old Alps-mount-switch boards, mainly ones with cheap printed ABS keycaps, such as old Chicony boards, will work with Costar-style stabilizers. But those tend to have bigass enter keys, and the cheap thin ABS sucks, so that’s also not a great solution. All the nice PBT or thick doubleshot Alps caps I’ve seen use standard Alps-style stabilizers.)