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I'm amazed at how brave you are! hmmm....how about if you just remove the shoulder strap the normal way (ie. no stud removal necessary), and Artbag just somehow attaches the shoulder strap to your Work (Artbag should know how somehow, I think?)? Then you'll have a Work with a shoulder strap, and a strapless but undamaged PT to sell?
I would try to just ADD a shoulder strap to the work without altering the part time.
I have a feeling it would be hard to sell the part time once the shoulder strap is removed. I doubt you would find a buyer for it.