From what I've just read, Orange Pi OS is an Arch derivative, which might make some people happy but unless you are a Linux expert it's going to make your head hurt. (Arch is a rolling release, which means you can never be quite sure what packages are going to be upgraded at any given time.)
I have successfully built and run op25 on Arch, but it was a chore, and not something I plan on directly providing any hand-holding to do here on the forum. As a starting point you're going to need to be on the "gr310" branch since that's the closest gnuradio compatibility right now.
Good luck!