I wonder if you could resaw them on a bandsaw mill if you sandwiched the planks between heavy, straight slabs to keep them flat. I'd worry otherwise about relieved stress in the dry wood causing cupping during the cut. The alignment would need to be perfect. Maybe find a 20" dia log, slice it down the middle, then put the boards between the halves and resaw while sandwiched. Might protect the dry boards from the moisture in the wet wood with plywood or something. Just imagining, no experience with that. I have no idea what to do about lubrication which is usually a stream of water.
I've cut a lot of dry wood on my Woodmizer but only straightening beams and edging, never resawing like that.
I thnk I'd saw it very slowly.