Mount them dry and attach a clear line to the bleeder valve with the other end in a glass bottle.That will show you when you have all the air out of the line plus keep it from making an unholy mess.
Seems to me you could even pump it yourself if you had no assistant, with the nuisance of having to keep stopping and refilling the master cylinder, if your clear hose is long enough to run into a jar where you can see it. Use a clean dry hose and don’t put any purged fluid back into the system. (Absorb the waste into kitty litter or whatever your local environuts say, although if non silicone then it will be water miscible, non-hint non-hint.)
Bleeder valves are designed specifically to attach a hose to them.