You gotta do what you gotta do to make it all square and level.

Trim the saddle as necessary, and elongate the left dowel hole as you need to in order to make it work. After you're done, you can make a 1" square (or thereabouts) scab out of 1/8" birch ply and glue it in behind the oblong dowel hole on the front side of the bulkhead. Then you can fill and redrill the hole where it needs to be. The ply piece will reinforce the hole and also capture the dowel, assuming the dowel is long enough.

If you can get to the front of the bulkhead, you can drill the dowel hole into the scab first, and then glue it in over the dowel with the realigned wing bolted in place. That would guarantee accuracy of the hole's placement. Might be a good idea to rub some candlewax or something on the dowel first to keep glue from sticking to it.

Rick