Hi gonk.
Your suggestion to logically reverse the trigger-1 and trigger-2 functions seems to have worked.
I swapped trigger-1 and trigger-2. I set each main zone input to turn on trigger-2. The main zone now works just as it did before. Zone 2 can now be turned on and off independently of the main zone and it turns its stereo power amp on and off just as you hypothesized.
Thanks again.
P.S. Am I the only person that has run into this "problem?" I am reminded of a quotation (maybe Jack Handy) "Always remember you are unique, just like everyone else."