I'm not sure why this post went unanswered. I only saw it now that you made an edit to it.
If you have BorisFX tools BCC Pixel Fixer or BCC Remover, you can swap out parts of frame with other sections, although you may need to do that on a frame-by-frame basis depending on how much motion there is. You may also be able to use the standard Replace Color FX or NewBlue Color Replace along with a mask so that only the strap is affected.
There's no magic tool to erase a moving object and fill it in with surrounding skin, though, and it may entail a lot of effort which might not be worth the end result.