Come on guys its not rocket science..... chop off the wing joiner, add another next to it and use epoxy..... Believe me a one side wing joiner with epoxy will not come off even if your plane is torn to shreds.... Epoxy usually holds even its a little piece, its easier to break with wood coming off than at the joint point....

Also its a trainer/sport plane not a 400mph jet..... I wouldn't do this to a f16 jet but to a fourstar its a no-brainer ??