I would recommend the Catalina Capri 22; it is basically a C-18 with 4 feet of cockpit added. Down below is a port-o-potti and 2 quarter berths, the rest is all cockpit.
I'm not sure about the keel configs available; I'm pretty sure I've seen Wing (2' 6") and Fin (3' 6"). The C-22 has a swing keel (2' 0" & 5' 0") so maybe that is available as well.
Catalina 25 #2818
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