I'm currently using a Raspberry Pi with their Debian based OS. It is on Bookworm, but there are major improvements to Plasma Bigscreen on QT6. They didn't make the updates before it was removed for Trixie, and Trixie is still in beta for Raspberry Pi, so doing an in place upgrade for the OS and compiling Plasma Bigscreen for it to see the improvements.
I think Manjaro (which works well on mobile too) has the latest one in their repos, and the KDE ARM OS may have it too if you want to try it without compiling it.
I want to see how difficult it is to drop in OVOS/Neon modules to replace Mycroft ones for voice control too.