You have probably addressed that somewhere, but would it be possible to run your UI stack somewhere else? (PostmarketOS).
My other wish for AsteroidOS would be for it to leverage Wi-Fi better. Not sure how much more energy it would use, but having a longer range for my notifications would be nice (at least on LAN). Being able to perform a few other actions independently of my phone would be great: weather % time updates, e-mail notifications, home assistant control, etc. I get that it may affect battery life as well.
While I'm at it: tiny bug report, but I adjusted the time while the stopwatch was running, and this affected the stopwatch result.