An easy fix would be a vote system during the first cutscene.

Everyone gets to vote on watching them or skipping. If one person voted to watch, it remains how it is.

Voting would be anonymous.

Abandon option disabled since it's only those 2 dungeons.

Anyone that leaves is subject to the leaver queue penalty. The intent would be to discourage people harassing one person enough to leave to bypass the penalty.

At this point everyone going into those dungeons would expect the cutscenes, but would be plesently surprised if they get the skip.