I had a few days where I could try the new webkit library with enough time left to revert/fix things if something broke. So far, so good.

I found I can use the home assistant web interface with webcat. (I can also get as far as logging in now with sailfish browser, but no further. Can't see any sensors or controls.)

I didn't try the other alternatives since I don't have Android support installed. I missed the "AlienDalvik" part on the first read and got really excited that there were other browsers for sailfish that I didn't know about.