David,
I suspect that you are more likely to get a reply from Alex if you
contact him directly. It might also be worth while talking to Clayton
Smith (
https://github.com/argilo), who would appear to have been
principal instigator of most of the recent changes to GQRX.
Alex was grateful for the help on GQRX, and may well be grateful for
assistance with the PPA. (If COVID gets under control, I might be in a
position to assist in that. The consequences of COVID result, for me, in
less, rather than more, free time!)
HTH, Stay Safe,
Robin, G8DQX