In that case.....is there a former ahead of the wing's leading edge high enough for a dowel to protrude from the wing into it? If so, drill out a hole in both the former and the wing for a 1/4" dowel and glue it into the wing/

Glue two hardwood blocks near the trailing edge of the wing (inside the fuse), flush with the top of the fuse. Add some 1/8" ply plates to the top of the wing so when you drill through the plywood (and wing) and into the blocks you will have a secure trailing edge.

I'd tap the hardwood blocks for a 1/4-20 thread. Make sure you are using epoxy on the dowel (LE) and the blocks (TE) and ply plates ( these keep the bolts from crushing the balsa TE)/

Jerry