A patchset is not an OS. Like I can make it work for myself but good luck making it work for users.
I thought you wanted it for yourself, though?
If you wanted something that lots of other people could use, in principle you could make your own Linux distribution with a particular set of patches.
You can't expect people to use your os.
The linuxCNC project[1] is a distribution based on the real time kernel extensions for debian for real time cnc machine control. It used to be possible to get few-us guaranteed latency, but with modern multicore machines you are stuck with about 100us due to the way the caching works. Still plenty fast enough for audio!
Good point, I've been down that rabbit hole myself.
Carefully-worded question: If OP is describing a single monolithic music production application, how does "+ Jack audio server" make the system more appropriate for meeting soft-realtime scheduling deadlines?