ok... reporting after the first day with the new Toto Drake toilet. Had to have the new toilet immediately, and no Caroma or other alternative available locally, plus the reviews on those others were just not as good overall... So we went with the Toto Drake standard height, round bowl, with a Bemis wood seat, professionally installed.
Said son, after first significant test run, "Man, that is one effective toilet!" with major amounts of relief in his voice.
Hope the results are sustained repeatedly! And a big thank you to Terry and all of you on this thread for the excellent advice and info. May I not have a need for it in the near to middle future at least!