Speaking of interchanging actors and parts, I read about a run in London of a play based on Frankenstein and Benedict Cumberbatch and Jonny Lee Miller are/were each in it. Moreover, each night, one plays the doctor, the other the monster and then they switch for the next night. I'd buy a DVD of this production (especially if they included one performance of each).
Just for fun, I tried looking up to see whether a DVD from that staging might be in the works. It seems there had been quite a bit of interest, but the necessary rights could not be secured, so an authorized DVD release doesn't look likely to be happening any time soon, if ever.