That sounds like a very nice method.

In the end it worked out with standard racecar procedure as well, just takes patience and diligence. All good, the 3/4 MC is definitely big enough.
It just takes 30 pumps or more to get the air down to the slave and some real pressure under the pedal, then gently need to push it out with the pedal with bleeder open, lock bleeder, and repeat.