Our shallow water tilt system was something like a 2 X 2 wedged in between the bracket and midsection, but the instant the engine hit something or hit bottom and lifted even the slightest, the tilt system was floating away. Too bad that engine uses a series of slots for the tilt adjustment instead of holes, otherwise if you were handy with metal a support could be fabricated that utilized an unused hole to support the engine at a higher angle and then swing out of the way for deep water.
Or use the electric going through the shallows