I have debated this too, decided against it, and as my GRS date gets closer I found myself revisiting the idea. I think it will be more than I want to take on at one time and I have never had any surgeries at all, so I think it's going to be best to just focus on the GCS and later get BA, after you have recovered. In the process of making my decision I have talked to a lot of people who have had GRS, and a lot who have had BA, and a few who have had both at the same time. The most popular answer from all of the is do not do them both at the same time.