Thanks to everyone for comments.

I probably should have mentioned in the original post that the RIB we will be towing is 21 feet in length.

Tito at Leverick showed me a couple things last year, adding one of our spare spring lines to the lengthy floating line we already had, connecting to the tow eye with a double neck bowline to the leeward stern cleat.

However, I was sort of thinking maybe there is some way to hook into some sort of rig between the hulls, underneath 'freebie' dinghy on davits as there is some hardware there....though you'd still be required to lengthen and shorten line in that setup too and in an awkward position/fashion.

We always appoint a crew member to man the lines when mooring/docking shortening and lengthening as required.