Well, I'm about to put my battery back in the car and try it out.
I didn't find any "bad" subpacks after analyzing it (worst I found was a significant imbalance, and the weakest stick was 75% of nominal capacity). I still think if you do a more thorough (36 hour) rebalancing grid charge, you might find it will come back online. Though if it does work, you'll need to keep re-balancing it periodically to keep it working.