I have previously watched several FOSDEM videos and learnt plenty. Sometimes the audio was a little challenging and Q&A was cut off if I recall.
We have had the Linux Conf Australia for a while, but it appears to have stopped running and the website hasn’t been updated. No idea what happened. It always had a radio stream.
There’s a couple of other radio specific days too.
As for your CFP, no budget for travel here, and I’m not yet at the show and tell stage of anything. I can talk your ear off about playing with radio, but I don’t think that qualifies as a “paper” :)