I just sprouted a Widow Banger, and I was a bit preoccupied with real life crap, I looked at it, the tap root was an inch or so out of the PT with its starter leafs open (crap). What could I do but plant it? It was slightly attached to the PT, but came loose easily, into the soil, and indirect sunlight (window) for the rest of the day. The next morning she went to full on sun and is doing well, when I transplanted her to her final home, all the dirt came off the roots (oh sh!t). and the tap root was holding to the bottom of the pot (with no soil, tap tap and she fell out in my hand). I planted her up to her neck, and gave her some voodoo juice, she is doing well, no shock even.
They can be saved even if they have no root at all,,,
In short go for it! What have you to loose at this point?