can you remove everything from his room, lock cupboards etc and only give him a couple of cardboard books? tell him why and if he stays in bed quietly resting for a couple of days will be allowed to choose another toy to take into the room for his rest.
My son was doing this a lot, he was younger than your boy, and I just had to remove all missiles and climb-ables. Only now can he be trusted to not go nuts... so the toys are out int eh family area and he can select a few special toys to take to bed. If i hear trucks being driven along walls or being used as missiles, I simply go in, tell him that is not on and if he does it again he will lose the toy. The follow through is the clincher tho and unfortunately it does cause tears but they often subside quickly after the toys has been removed and forgotten.

If he tears his bed apart, I make him help me make it and talk about why we don't pull all our bedding apart.

So just remove the objects of the behaviour rather than him iykwim
Yeah this sounds like what I would try. Even though I am not there yet, I would say that sounds right that he is picking up on the fact the new baby isnt long to be here and is trying to express things he cant yet.

Extra time with him before bubs arrives might help too. We are going to TTC mid to end of this year and I'm anticipating the same sort of behaviour from DD, just becuase she already now gets frustrated with things she cant express yet.