If you cant fly it with a trim wheel, get the attitude you desire by having the pax move up and down the cabin.
If the aircraft nose is too high, fill the front seats/ aisle, laps. If the nose is too low get every one in the rear... FO too if it helps!
I remember reading a report of a crash where a similar sized plane crashed due to an alligator(or crocodile) getting loose and every one running to one end of the aircraft to get away from it. Don't know if its true but very believable.