Yeah, I keep my eyes open for something that'll work, but haven't run across anything as of yet. It's not a real high priority; anyone who ends up stuck in the water, worst case a call to the CG would get help reasonably quickly (at least where I am.)
In truth, unless I was solo on the boat, we could probably get a majority of people into the boat without too much trouble. One exception would be my regular dive buddy (a really big guy), but he's already been warned that he's waiting for the CG if anything happens.
Worst case is I rig up the dock lines (4 of them - I keep one on each corner of the boat as standard), and work it that way; it'd be a little fiddly, but I'm fairly sure it's doable.