this is where I miss the like button of facebook.
I like the idea of removing the thread basting.
Have you not had the opportunity of removing a thread that has been sewn over, split? Not fun and cannot imagine the task of removal. once you get an area of Free Motion quilting.. the basting can be not an issue.. the general area is stabilized.
PS try a sandwich of your fabric and batting and FMQ an area to get a good feel.. you may like your thread basting or, you may opt to remove it before you cross over the area.
Good luck all the way around..