I uploaded fresh images, that includes a trixie-edge-desktop-mate image I tested with my Hardware. Mate looks good and working, but switching between internal / HDMI audio needs some fiddling with the audio setting widget (may be a misunderstanding between pulseaudio and drivers). Changeing Sound-Pref:HW:profiles seems to do the trick. There is no chromium for RISCV, thus you need to install firefox-esr or netsurf-gtk manually.
I think this is ready for primetime now, so I clicked on the "Pull-Request" button (see https://github.com/armbian/build/pull/9299). Got lots of auto email from the Github robots, will check tomorrow.
sven-ola's post in Orange Pi RV2 was marked as the answer