The best solution will be to retool these two dungeons into solo instances, with MAYBE ultima weapon 2nd fight + lahabrea as a trial.

Barring the development time that would take the current solution is best. If you don't want to deal with the cutscenes...just don't queue. There are plenty of other options in this game to get exp and tomes. If you don't want to deal with the cutscenes, just do something else, anything else. Other roulettes, individually queued for duties, fates, whatever. It's super easy to avoid the cutscenes. Just don't queue for main scenario roulette when you don't have the time or patience for them.