Hi pico, thank you for joining!
Well, I got the idea yesterday when I realized I will have more free pins than I expected on my current project, so at the moment I don't have the necessary hardware. As I wrote to pico, the main question was whether this project was possible (now confirmed I think), and which hardware should I buy, that pico and now Riva seem to confirm to be a couple of RF transmitter and receiver.
My fear was waste 1/2 months waiting for something that doesn't work for my case, and then wait again til April/May to try again.
If you say this is the setup I need, I'll make the order =)