I have not tried this but I don’t see why it wouldn’t work.
If the center ribs don’t have enough to put a screw through them, just make two extra ribs of light plywood or basswood about 3/16 thick and glue then to each wing half.
Then just use this nylon straps
http://www2.towerhobbies.com/cgi-bin...?&I=LXDMG5&P=7 something or similar and secure both half’s with them.
I get this idea from the Hangar 9 P51 PTS Mustang, look at the manual (page 7) it will provide sufficient info on how to do it correctly. (They only use one, I would use two or three)
http://www.hangar-9.com/Products/Sup...ProdID=HAN2825
My buddy has flown his P51 like this for over 50 flights with no signs of wear. Just make sure you use a few drops of thin CA on the holes where the screws go in to harden the wood.
Let us know how it all works out