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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....
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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)