This, and as all is running random normals to grind cp, have fun getting the quest in a long normal dlc dungeon.I mean it goes both ways. A lot of people would just abandon the dungeon if they got one they didn't like, requeue, repeat. People do that already and just swap to another character
Get rid of the penalty for leaving and maybe create a 5 minute grace period where you can't leave the dungeon. That way you temper the urge to immediately jump ship for some reason and at least give the group a chance.
If you leave in the first 2 minutes you should get a 30-60 minutes penalty. Several times people leave without even trying and it's always the tank or healer role. At least try before you leave and see how it goes.
Maybe let the penalty start at a hour and decrease at a 4-1 ratio until zero.
Stay strong, safe and enjoy the journey
What´s wrong with a fake healer, except if it is a vDLC HM?
Get rid of the penalty for leaving and maybe create a 5 minute grace period where you can't leave the dungeon. That way you temper the urge to immediately jump ship for some reason and at least give the group a chance.