There are a myriad of regional clubs that cater to weak signal operations from VHF into microwave bands. SBMS, SVHFS and FLWSS are some I am aware of. The technology for microwave experimentation is as older than ARRL itself. J.C. Bose 60 GHz experiments in the 1890s.

I guess what I am saying is that there is no big leap to build or acquire microwave gear suitable for satellites. Perhaps some folks in the weak signal OPs are already AMSAT members or could be enticed.

"I'd like to learn more about microwave ham radio.

Bob W7OTJ"