You're the project manager. I'll throw an idea out. Get a Moeller tank and run the water from your wash down pump, above deck and temporarily. A good excuse to install a wash down pump if you don't have one. I use a 40 gallon tank on my 2320. When I am not using it, no impact on the boat whatsoever. Probably use it for 25% or less of the trips.
I added 6 rod holders on top of the tank. With a few inches of water in there you can trailer with rods in the livewell rod holders. Use the lid for a cutting board, use the molded in cupholders for sinker/hook/bait storage. No loss of your good storage.