The big question is this: Do you want to be in the indoor bonsai business? It can be a lot of work to provide the right environment, and every move inside and back out impacts the tree.
When we lived in Iowa, I had tropicals and temperate trees. I rented a 4x6 U-Haul trailer, affixed benches inside, and pulled all my trees to Nashville in June, and 3 months later, on down to Birmingham.
By my first winter, I fully divested of tropicals because I just didn't have the space or time to deal with them. But, more importantly, the trees that do well here (Charlotte similarly) opened up a huge variety of hardy trees that required no real special care.
Now, unless we get a late freeze after I finish repotting, everything can sit out...which is probably closer to what you get to do now in South FL.