I have used the Android TV and bVNC until some months ago. I'm using a PC with Debian 11 Xfce (its compositing disabled) since then, directly connected to the TV now via HDMI. It causes a little eye strain, but I hope to achieve a training effect. The graphics card is an MSI GT710 (first generation) and the driver is the official Nvidia driver with dithering disabled. At 4K, the graphics card only manages to output in 30 Hz. Perhaps that also contributes to less eye strain. So, currently I'm not using a VNC connection anymore.
One other thing: I have also installed the latest Windows 10 on this PC, and it really causes more eye strain and fatigue over time.