That's fantastic, I discovered earlier that I had some plugs like those and now I'm trying to make them work. I've managed to make them turn off easily enough, but I can't for the life of me get them to turn on.

Would anyone happen to know how I can tune in to my remote's frequency (144.63 MHz, it says, even though the remote operates at 433.49 or something) and listen to the tones it generates?

Thanks for that link. The PiHAT page does a much better job of explaining the details of how this works to me (as someone with a lot of hardware experience but not a lot of familiarity with the Broadcom SOC on the Pi).