Attaching wired feathers to a harness?

I'm usually pretty crafty but this feather spray back piece has left me scratching my head.

I already have a simple harness with a center strap that runs up to my neck from two bands that go around my waist. I was going to get some 12(?) gauge wire, but I have no clue how I would go about attaching the wired feathers. It's totally fine if they bounce and wobble, but I don't want them rotating and turning downward. Ideally, I would like whatever gets fastened to the harness to also be somewhat comfortable too :)

If it's important to note: I don't have a machine that can punch/sew through leather, but I am proficient with a regular sewing machine. This feels like it will more likely be a foam or glue project...

For anyone who is curious, this is one of the Fruit Blood band members from Brad Neely's Harg Nallin' Sclopio Peepio

Here is the harness I already own:

https://preview.redd.it/1mowi8dxdksf1.png?width=1044&format=png&auto=webp&s=9b827a17451760630c1deca5e30d92fb01d374fe

https://preview.redd.it/k458o8dxdksf1.png?width=1048&format=png&auto=webp&s=fe61449e9a637f15dca7ba7450e490e51571b2b3

I need to stop trying to make costumes from characters that aren't based in reality haha! Literally any and all advice is welcome.