I just can't thank you enough for the expansive details you are volunteering to post here.
It definitely helps to fill in the blanks for those of us not fluent in these matters. KUDOS!!!
But all answers bring various pieces to the table to fill the puzzle & are helpful.
I may choose to go with a nonCommunicating Tstat as I'm thinking about this.
What you said confuses me compared with what the Comfort-R Pocket Guide indicated about Constant-On (Hmmm).
I don't know, maybe there's a difference in just using Constant-On from Tstat, versus the points made on "wiring" setups referred to in the Comfort-R Pocket Guide, as being the reason that Comfort-R is prevented by using Constant-On.
It's all baffling to me. Oh well.
If I could make out (read) the little encircled numbers on the Comfort-R Pocket Guide next to each wiring diagram shown for Constant-On Fan Speeds, I'd have some answers immediately on parts of this.
Life goes on, ha.
Thanks so much.