What worries me is that this valve doesn't seem to have the two part construction as compared to the valve described above. I haven't been able to find another valve like mine; the "bonnet" and the valve stem nut seem to be the same.
I think your worry is justified.
I think that turning off the water to the house to replace the valve will be a big deal (half the complex with water off, probably hours for the system to drain etc. etc.) although I'm going to investigate that.
I think the plumber could let you have the pressure back on pretty quickly. The valve could be a compression valve on the copper, so that would not need the pipe completely dry, as it would have to be if soldering.
Even faster would be a Sharkbyte connection.
When replacing the valve, the water could be turned back on to the rest of the complex while the connection downstream of the valve has not been done. I am not a plumber.
If you get a new valve, maybe consider a whole house cartridge filter, with bypass, at the same time. Have you ever seen particles in your aerator screens? That was only the stuff too big to pass through the screen.