SFFrontRow- I like your ideas, but so much of what you describe already reminds me of Plain and Fancy, minus the community putting on a show for the couple. The show itself is charming, if slight, and definitely seems to come from a different time.
Properties like Green Acres, Golden Girls, Bewitched, I Dream of Jeanie, etc are better suited for parody, IMO, than musicalization or translation to another medium. The shows were very episodic with huge gaps in continuity. They played on repeating similar jokes based on character traits, rather than stringing along storylines. Charles Busch could do well with Green Acres (perhaps he already has), or someone of that ilk.
The best feeling they could create with a full-fledged musical would be to capture a Lil Abner vibe. That of course might prove too old-fashioned for a lot of people.
Marie: Don't be in such a hurry about that pretty little chippy in Frisco.
Tony: Eh, she's a no chip!