Ok,, I used epoxy to set the wing joiners. Then after it cured I found a bit too much gap so I sanded it down till I got a super tight fit.
I had to go to a 5x16 bolt and wingnut to make it work. But that's not a big deal since I'm using a 91FX and I can spare a bit more weight.
On the rear area of the wing I used a couple of collet type prop adaptors from brushless motors for my lockdowns. I removed the collars and inserted them backward into the holes. Epoxied them in and used thin paper washers with foam safe CA to finish .
The prop nuts have holes through them so a small screwdriver or nail can be used to tighten them up at the field. They are holding very well so far. And since they are aluminum they weigh practically nothing.