Oh, change the damned thing a tad, why not? I saw it last month, and one of the creakiest elements is the reverential treatment of the "character" of Zach. The Svengali-fied disembodied voice, the humorless approach to all proceedings (I never noticed how he never, ever, even kids with anyone.) All that barking of intrusive, psychotherapeutic questions, seeking answers that are frankly none of his business, and no director would really be interested in.
So making Zach a cute, younger wunderkind who is a bit too big for his britches (!), and jumps up on the stage to ask his nosy questions and try to jump start an old romance, hey, why not? Let the show breathe! The strict adherence to something done in 1976 is like making every Dolly literally squeeze into Carol Channing's red dress. Bring on flesh revealing shirts, a few tweaks, and above all, some compelling way to shake the whole thing up.
"I'm a comedian, but in my spare time, things bother me." Garry Shandling