Almost forgot about this thread.
For the time being i switched to a Minix Neo U9-H and i use kszaq [8.2.2.3] LibreELEC 8.2 for S912 on it.
This meets all my specs so far.
4k HDR BT.2020 looks proper on 2k beamer and 4k up to 100mbit (don't have higher bitrate sources) plays smooth.
Though cannot say if it plays properly on a 4k HDR beamer.
Interface is also much smoother than on the C2 and it does not get nearly as hot. The C2 gets extremly hot sometimes.
It may not be the cheapest box, but it surely is worth the money.
Especially with the remote on/off.