Pete- This is a tough one!
The absolute best for launching would be to build a ladder attached to the trailer tongue that fits up to the top of the bow rail. For this, I would find a local trailer builder that offers such options and have him custom design and build one for your situation. I have such a ladder on my pontoon boat, and it works like a dream, although the height on the C Dory will have to be greater because of the bow pulpit.
Alternately, one could have a multi-purpose stainless ladder fabricated by a rail shop that would be hinged on the bow pulpit and swing down to the trailer for launching and to the shore when beached for embarking and disembarking. It could be folded back on the deck when not in use, or have ball-lock hinge pins pulled and then stored on the roof or elsewhere. For those of us who like beaching the boat at the bow, this would be a great improvement over climbing over the "jungle gym" bow pulpit! The rungs could be made somewhat flat for greater comfort, and/or fitted with non-skid tape for grip. The type of anchor and bow roller would have to be considered in such a design to allow adequate clearance. Adding a "landing platform" on the trailer tongue for the ladder base might be useful, depending on the design and space availability.
