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Re:ARM-Ed Mac: We Have an Answer by ken on Sunday March 22, 2020 @07:17PM (#22659710)
If you don't limit the discussion to "Macintosh", Apple had a 4th architecture (and a 3rd 'transition'): 6502. There were third-party software emulators for 6502-on-68K, but Apple only provided a hardware one.

https://en.wikipedia.org/wiki/Apple_IIe_Card

Re:ARM-Ed Mac: We Have an Answer by classichasclass on Sunday March 22, 2020 @11:14PM (#22660936)
Officially, yes. Unofficially, there was Gus (65816, if you want to be pedantic, though Gus necessarily ran Apple II software as well).

https://en.wikipedia.org/wiki/Apple_IIGS#Gus