I'm a bit (a lot, actually) puzzled. Dirac was one of the leading theorists of his time. Can it be that he refrained from meditation over the very essence and core question of his discipline?
Anyway, he and Bohm lived in the same country for many years. Probably, they knew each other personally, met on many occasions and had conversations (I am not familiar with their biographies, just guessing). Is there any chance they bypassed this topic in their discussions?
The very essence and core questions of physics are not interpretational issues on quantum mechanics, which are rather on the boarder between physics and philosophy. Dirac was pretty pragmatic about it and took the standard Copenhagen interpretation of his time (to my dismay I learnt in another thread, he even subscribed to the collapse hypothesis :-().