Due to various barriers I've changed my mind and I'm in the process of porting the trusty Pixel 3a to Halium 12. Not only am I working towards a larger system partition size, I also will help folks with VoLTE enablement, which I can't test with my carrier.
This is a little side gig but if you want to vote for higher priorization, I'll happily accept donations to let me know that you *really* want this. Further links at https://fredl.me
Why Halium 12? Android 12 was the last version supported by Google and shipped with a roaming enhancement specifically for VoLTE. I'm basically betting on better chances for VoLTE support. Also it allows for a dynamically resizeable system partition, exceeding the storage limits of the current Halium 9 port.
Of course it will be a long road because so much has changed between H9 and H12, and there is a lot to forward-port in terms of features and improvements from H9.
Don Fredl's Circus