@Pilou: trimstencil is 5, so less -> that's a win :P . It get's even better in more complex situations (more objects for example). And note I'm not trying to force anyone to use a given method - quite the contrary, I fully understand often there are multiple ways to reach the solution. I simply tend to look for one that requires least amount of steps :) .

@Michael: thank you for the links. For sure will start tinkering in the weekend :) . Html should make it easy to do customization - glad to hear it works this way.

As for __GL_MaxFramesAllowed=1 - so far I haven't encountered any issues with the trial version. Tried in KDE and Gnome. No issues at all (fingers crossed) - really feels like a native app.
Atm I have some hope to try packaging the prepped version into Appimage. Should work a treat.
With MoI V4 and DXVK it should be even better :) (once it is released).