I'd go with your idea of a drop board there, and maybe a folding ladder somehow.
This boat was offered with an outboard power option, and IIRC that was where the motor mount would be.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"