An update on this, I seem to have made some progress, but without completing the objective.
I added the following to /etc/apt/sources.list instead of the previous entry
deb [signed-by=/etc/apt/keyrings/obs-home-amazingfate.gpg] https://download.opensuse.org/repositories/home:/amazingfate:/panfork-mesa/Debian_12/ ./
and then ran:
sudo apt update && sudo apt upgrade -y
sudo apt install mali-g610-firmware
The install appeared to succeed, however OBS Studio still throws an error.