BTW, the anemone hosts the clown, not the other way around.
Of the multiple species of clown I have kept, Maroons have always been the easiest to pair with an anemone (and the hardest to pair with each other). I just about guarantee your Maroon would be hosted by a BTA given the opportunity. Whether she would share with the little occy is an entirely different question. Only keep them them together of you are willing to accept the fact that she can shred him at any time.
Also, as she matures, she will become more and more territorial. She will likely move any corals that you try to place near her "territory". I love Maroons, but as mentioned above, I love them a lot more when they are in a tank setup just for them.