Don't worry too much about the wedge. Make sure that the 2 top, and 2 bottom spars are touching, and you get a good epoxy bond between the spars and the wing joiner. Once the epoxy is on and everything is set properly, add a drop of CA to the leading and trailing edge to hold them in place while the epoxy cures.

Once the two halves are together, go ahead and sand the leading edge so they are even. (That small amount won't hurt anything.)