I have a loud keyboard I don't mind parting with. (maybe for the broken M2?) I think it might be Alps switches, but I'm not sure. It's a Teco/Chicony keyboard. It uses a large DIN connector, but works great with a DIN to PS/2 converter, and even a USB one on the end of that. I can get pictures and a recording of it if you want.
Amiga 4000: Apollo Turbo 040, 128MB Fast, 40gb HDD, CD-ROM (needs internet)
C64: 1541U-II, MixSID, WiFi, LumaFix64
ZX Spec, A1200, CD32, MacPlus/SE, A500, BBC Turbo Master (NASA), 2600, Acorn 4000, VIC-20, IBM 5155, GameBoy