Uhhhhh….Velcro?  If you attach nutplates, as far aft as possible, to the lower aft skin on a shallow standoff that might handle the structure.  Industrial strength Velcro could keep the trailing edge from moving too much when the flaps are down (no guarantees).

Steve Colwell  Legacy 15SC 

ps: Tom builds a beautiful and affordable panel

 
While working on my Legacy kit it occurred to me that once it's flying inspection

and maintenance of the main gear would be so much easier if the stub wing skin

could be removed.  I attached a hinge to the leading edge so that the skin could be
opened as shown in the picture.  Now I'm trying to decide what sort of fasteners

I should use on the trailing edge.  Any suggestions?
 
Tom Gourley