How to set the resolution from the command line?

Oh, I didn’t know there was a fork of Moonlight (and Sunshine, the server part).
Do you talk about this fork (and this one for the server side)?
I don’t think the fork supports Vero, especially since they don’t seem to have forked moonlight-embedded.
I’ll try these and contact them as they seem very responsive.

My concern is that I can’t test it trivially myself as I don’t have a machine lying around with Windows and an NVIDIA GPU

You need neither Windows, nor a NVIDIA GPU: I currently stream with Linux using Sunshine as the server software on a PC with an AMD GPU.

If so maybe it’s time to package it up and add it to our App Store, as long as Kodi can be restored gracefully.

I recently started having an issue, but I’ve been using it for around a year, now. There might be other quality of life improvement to be done (like the resolution issue I talk about in this thread) to be fixed before packaging it.