If your party leader has the popular weakaura "Instance History" installed, this allows you to use them to automatically reset instances for you.
To use: Ensure your PL has "Instance History" installed, and is outside the instance (your PL can be a level 1 AFK bank alt). Then, say !resetme in party chat and log off. As soon as you log off, your PL will automatically reset instances, so that you log back into a fresh new instance.
Only tested with a party size of 2.