Maybe...if...
I could see something positive if you had a PoD involving Dred Scott or some similar case going in favor of Scott, with the interpretation of the laws being that if a slave makes his/her way to a free state or territory, then he/she is free. (by the way, this is a major change, and there may not be any reasonable way to do it on Scott, but I'm not able to lay out a logical sequence right now) If you start with that, then perhaps a successful rebellion is one with the limited objective of bringing a large number of escaping slaves to free territory.