Norm

I have been in a similar situation. Not sure timing for a hotel is warranted. You will have to be at the airport in CLT by 6 AM, plus taxi trave ( about 30 minutes each way)l , room check in check out., minutes to relax before sleeping. I feel it would be less stress to just stay at the airport. What ever you do it is going to be a loooog trip back home. I would just keep calling AA for hopefully some better options will pop up.

OR

Stay an extra day in MIA, sight see there and catch a 2 1/2 flight back to STL direct.

Wendell