Heres a little update on the progress.
Day 3 of Harness, we had 2 days off from it as I had a busy weekend.
As soon as he thought about playing with it or grabbing it I redirected him asap to his new toy and all went great, then we went straight outside, he wasn't interested in biting it so much as previously or take it off him however just had 1-2 bites at the clip on his chest, so I gave him a blade of grass to play with instead. Although I can't do a whole lot with him outside yet, he will recall on cue a few times and then exercise his wings and come back to me but he is still distracted by the new surroundings.
Taking the harness off him was a bliss as he was good but I happened to be the rusty one taking it off lol, however he tolerated it all very all.