I like the idea. Maybe not a complete block, but maybe something similar to a lock such as one used in canals (e.g., Panama). You control how much information Banner is able to process, helping him navigate the morass in his head, much like the amount of water enters a lock, and ensure that he is stable (accepting the truth and learning how to live with it) before he moves on to the next part of his "canal". We have seen what happens when he does repress, suppress, or lock up any emotion--at some point, it leaks out or even worse, it erupts (re, Savage's return when Joe was the primary Hulk).
What compounds the issue is finding someone they all can trust. Outside of Sampson, who is there? Strange is somewhat questionable, but Xavier and any other telepaths would not be welcomed.
Not 100% sure I'd trust Samson, but Dr Strange I would trust.