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Is the any way to connect everything and THEN bleed the MC? Would a Mity-vac unit bleed the entire system including MC?
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Yes, there is. Bench bleeding is a time and labor saver. You can bleed the master on the vehicle. It works best with a pressure bleeder attached but it can be done without. The difference is that you will usually have to spend more time. When I have to bleed a master that has been completely emptied I pump the ever living snot outta the pedal using a bunch of short and quick pedal presses letting the pedal come all the way back each time. On the final press hold the pedal down as always and open a bleeder.
The challenge to doing this comes when you have a system with an isolation valve that locks out 1/2 of the brakes if there's a pressure mismatch. Getting the valve to unlock sometimes means waiting overnight for pressure to equalize.
FWIW I never seem to have good luck vacuum bleeding.