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.
1984 Fast/Nicholson 345 "FastForward"
".. 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)