This appears to be a really activity trap
you might be better served in buying a new wing and just replacing it.

The cost associated with more time to correct the issue will more than cover a replacement.
or
You can work on it another 2-3 months and come to the same conclusion

Look on eBay
(BTW if you’re planning on keeping the car for awhile, it’s a good idea to start collecting spare parts.)

I don’t think anyone is making that wing for any other cars. Not a bad idea to have a spare.