Well after ordering the brackets and taking a closer look, it looks like it could work, with significant effort. There is a backing plate that is wedged in there behind some other fiberglass supports. To get to it you would need to pull some pieces of the interior off, drill out the rivets for those supports, pull them, putt the new backing plate in there, rerivet the supports back in and then maybe, that might work.
Looks to be quite the effort and people who are looking to do this should know that it is not just a simple bolt in, bolt out bracket change.