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Join Date: Sep 2005
Location: New Westminster, BC
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These may be pricey, but clicking around their offerings it looks like there's a reasonably compact folding mechanism and it provides stairs rather than ladder, and a dinghy platform at water level. Even if these guys are out of range (they seem to cater to the big boys), a good fabricator might be able to get some ideas for something similar but scaled to your needs.
It should fold up alongside your current railing amidships when not needed....
MarQuipt ... A Reputation for Quality,*Service, and Reliability
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)