Easy to make this wing into a two piece, plug together. The plane is very light so you just need enough strength in a tube and socket connection to duplicate the fiberglassing of the center section.

I have done this to a couple one piece wings that attach to the fuse with bolts. It has worked very well. A 15" carbon tube for example was used in a 10 1/2 pound Pattern plane designed originally with a one piece bolt on wing

You will need a 3/4" OD carbon tube or aircraft grade aluminum, about 15" long. The idea is to install 7.5 inches into each wing half. For this little weight you don't need any longer connector tube than that. Connector diameter is overkill at 3/4" but that's readily available material. 1/2 OD x 1/16" wall would work great too

Anyway, you will need snug fitting sockets for the carbon or ally joiner tube. These sockets will be glued into holes in the first 3 or 4 wing ribs at center. Make sure you cut the holes at the correct dihedral. Cut the holes using a sharpened thin walled copper tube that just fits the sockets.

Reinforce the ribs around these holes with 1/64" ply. Best location for the holes is between the spars.

Make a kit of all the parts and set the panels up with sockets installed and carbon joiner in, at the correct dihedral. Set it up without the top center section sheeting of course, and super glue everything together. Add webbing between the spars and the sockets. Add to sheeting. Separate the panels and voila! This can be done very light, lighter than the fiberglass center reinforcemnt. Good luck. PM me if you want mor edetail