I could have been clearer with my original question. What I meant to ask was that if I could access the bleeder, was it still necessary to remove the slave cylinder to manipulate the pushrod and plunger. I now realize it's not necessary.
My Haynes manual covered two setups -- internal slave with bleeder and external slave without bleeder. Thanks for pointing out my good fortune.
Yes, that's right. The slave did not need to be removed. I opened up the bleeder, got some air out, and did a 20 minute test drive without any more shifting issues.
All that's left to fix are a stuck door lock and a window regulator. Hard to believe this thing is 34 years old and in near perfect mechanical condition.