Since you don't like virtually everything about RuneAudio+R e1 and you've tried it, you should stay with your current version.
I have to respectfully point out that since the last 2 or 3 updates for Re1.2 the stability of the system has declined. I too get pretty much the same issues.
So yesterday I flashed the 'old' Re1.1 and that pretty much works fine from the start albeit without the ability to do updates since the latest versions have migrated too far away. Even the library builds correctly over wifi (a major problem since Re1.2 for me)...
While I really appreciate all your time and efforts, and I'm sure we all here do, there appear to be some major issues since those last versions. If you could provide a way to debug to some of us, that might help.
It seems reasonable to believe that there are some who don't have issues with their hardware configuration and they won't complain about it either... if one experiences problems, this is pretty much the only place to come to.
Personally I understand that you would like to move on and get Rpi4 support up and running. Fact is, the older versions are still around and probably not so easy to replace, financially or technically (e.g. built in a dedicated enclosure). If the new software is stable, there is no reason to upgrade the hardware.
I can't believe that this has to go the same way like with major cell phone companies, every update reduces usability so you get 'forced' to throw out and get the newer hardware.... that's the beauty of open source software we can prevent this.
As always, I'm personally more than willing to devote some time in testing and debugging but I sense some apprehension when some issues are reported...