"(It does seem to be set in a modern day, I don't know why but it worked against the words, music and tone of how the show is written and works, making it not work in many respects now)."
You don't know why? Maybe that's just an expression, because it sounds like you know exactly why. EVERYTHING about the show screams "early 1960s" -- the music, the lyrics, the overall sensibility. To move the action to the present day strikes me as an incredibly bad idea.