Reverse bleeding is almost certainly going to face the same sink trap problem. The forced fluid will course under the air pocket. Almost all the nasty stuff first collects at the bottom anyway, I would not want to push that upward.
2002 Black Standard Brakes "TE MEGA MONTY"
"Well, Chester; choos'n friends goes kinda fast once the shoot'n starts." Mathew Dillon to Chester Goode