I think I'd prefer someone throwing money at getting the pro-shot versions of the stage shows released, but I understand the desire, and expect that getting adaptations made would be strangely easier.
It's very hard to think of Broadway/off-Broadway musicals which were improved by Hollywood adaption,
Yes, I've seen them. Or, at least the first one. The question explicitly refers to adaptations that weren't successful, and given that Gor was kind of a direct to video chump that hardly anyone knows about, I think it qualifies.![]()
Gor
Gor is a two-parter film series based upon the Gor book series. The films are Gor (1987) and Outlaw of Gor (1989; aka Gor II). Very loosely adapted from the first two books, the films depict professor Tarl Cabot's adventures after being magically …tvtropes.org
My Ravenloft campaign owed everything to that movie.I would love to see a properly rebooted Captain Kronos - Vampire Hunter that would lead to the franchise we should have gotten.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.