Assuming fully functional struts (not just there for decoration), I think the area of the wing joiner is going to see compression loads only - the 2 wing halves will be pushed together. The dowels and bolts will handle torsional loads. If anything might need to be beefed it might be the area between the wing saddle and lower strut attach point, as well as the attach point itself? I would try it.... for the intended use of scale flight/aerobatics, nothing too violent?