This might be the thing to get you going: try flatpak/flathub.
Command line version, since this is the quickest (run as root):
apt-get install -y flatpak-builder
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak install flathub moonlight
Installation works, but during start I got the message: "No functioning hardware accelerated video decoder was detected by Moonlight." Since Moonlight is containered, it might be not having access to the driver of the host system. It might be that I was running it on Wayland.
Between daytime job and other duties, I'm lacking the time to come up with a full solution, but one option I see is to for the original moonlight in an own hub, where it also depends on the libraries required for accelerated video.
Hope this helps,
SvOlli
Edit: reading the second post, which I missed somehow, I see this doesn't help. Sorry.