JFB, nothing is that simple in this life. I've tried such a scheme and found that the seals are one-way; if you pull a strong vacuum on the 'wrong' side of either the clutch or brake master, instead of pulling bubbles up to the reservoir from 10 feet away, it will often pull air INTO the system at the master cylinder piston. Some guys do pressurize the master cylinder cap(s) to help push bubbles out the bleeder nozzles.
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