Has anyone had muscle sparing lat flat?

Stage 1A 2016. I had a single mastectomy to avoid radiation. In 2017, I found a recurrence (they believe it was seeding from the original biopsy) right under the skin of my mastectomy, on top of my implant. Then had 36 sessions of radiation.

Fast forward to today. I just turned 40 last week. My foob has shrunk by more than half bc of radiation and it’s super high (like, almost clavicle high lol). I still have my native breast which is now bff with my navel, as they hang out together these days 🤣.

I am not a candidate for DIEP (how this is possible, I don’t know! CoVID has not been kind to me! 20 pound gain in a year. Ouch!).

I do not want anything done that includes cutting or repositioning my muscles. PS has offered to cut out skin and fat from my back to create a skin graft for a new/non-radiated boob and an implant. Has anyone had this done? I would love to hear your experience!

Have you had skin/fat grafts from other parts of your body? What was the experience? Are you happy with the results?