I still think you are making this a bigger project than necessary. And everytime you do that you run the risk of the car sitting there forever until you figure out how to get yourself out of that jamb or get fustrated.

Go jack up the other side of the car and see if that wheel cylinder is leaking. And see how much brake shoe/pad material is left.

If ok, just change the master cylinder today.

Anyways, at least TODAY spray some penetrating fluid on the bleeder screws of the other rear drum, front disks, and master clyinder line connections. That will give it soak in time.

and i think WE have made the job bigger than it is!