Thinking about a minimalistic QO-100 station, RX testing proved to be successful!
Golden Media GM-201 LNB unmodified, DVB-T stick and USB powered LNB injector. Easy copy of CW signal and probably also PSK beacon once the LNB has reached thermal equilibrium. Thing is, that the operator is also nearing rapidly thermal equilibrium..
I have successfully uplinked with an 11dBi (13cm square) Wifi panel. I wonder what weak signal modes could work under those constraints (I'm thinking EM-comms usage here) . I suspect you'd still need to GPSDO the downlink, but then again, the uBlox modules can be reconfigured to output more than 1 PPS...Not sure if they can get to 25MHz tbh
Finally.,C2H5OH (or related to it) can help "operator thermal equilibrium"