I have no doubt that I can do a paddle reentry when physically fresh, but I wonder how well I would do after 15 miles, and in colder, rougher waters. Just lifting myself out of the boat after such a long paddle sometimes gives me terrible cramps in my abdominal area.
They make paddle shaft holders that mount on the rear deck–they will lock down the shaft so you can get some extra strength from an arm/hand that was holding the paddle perpendicular to the boat. Also, with two paddle floats, you can have “pontoons” in case you get sick, or have an unplanned need for some gear in the front or rear hatch,
(It looks like your rear deck cannot have much curvature)