I am into my second Honda Odessy in 10 years. I love this van, back row folds in and disapears, middle row is two bucket seats that are now in my spare room as reading chairs. My airplanes are in the 80" to 100" WS and if I get creative I can fit 3... but I move away from the original question...

Given that you are willing to cut the wing open, get an aluminum tube with phenollic sleeve that is about half the thickness of the wing at the point where you want to install it. The length of the tube needs not exceed the length of the current wood joiner that you are going to replace. Place the wing on a flat table and prop it such that it is at the proper diehidral. Look at the wing from the front and place the tub in front of it (experimentation can be done with a wood dowel before you buy the aluminum tube).

Looking at the wing with the tube in front you will see where the holes in the ribs will have to be cut. Cut the holes bigger than the tube and cut one or two lite-ply disks for every rib that the tube will go through. These disks will have a hole in the center the same diameter as the wing tube and an outside diamater bigger than the holes that you cut in the ribs.

After removing the covering and cutting the holes in the ribs place the tube inside the wing with a disk on either side of the rib until you can prop the wing back to the original diehidral. Secure the wing as best you can to make sure that while you work on it you do not accidentally change the diehidral or separate the two wing parts. Glue each disk to the ribs with good glue (I like Titebond II) and wait for the glue to fully dry.

To hold the wings together open a small section of the bottom side of the wing to access a nylon screw that connects the two parts. The screw should be as close to the wing tube as possible while providing the best access to it. Also add a small short dowel on the back of the wing to maintain the alignment, this may not be necessary as I believe the Cb wing is attached with screws to the cabin top

Recover the wings and you have a two part wing, easy to put together and easy to carry in your small SUV.