I agree with Adair, azalea branches are difficult to bend once they are over 2 or 3 years old. You have a nice start, and in a general way your drawing is a do-able goal, though you won't be able to bend the thick trunks much if at all. A nice 5 trunk clump in progress.
Good news about azalea in general, trunks do thicken nicely in pots, you don't have to put them in the ground to grow out. Given that you are in Florida, and your local soils are coral limestone derived, the local soil would probably not be good for azalea anyway, so pot culture from here on out is appropriate.
You have a plethora of branches sprouting on your trunks. This is good.
If it were my tree, I would continue building this tree in stages. You have the main trunks, now it is time to develop the first set of branches. I would choose 3 to 5 branches on each of the 5 trunks, to be your future branches, and eliminate the rest. Let these extend, without pruning until they are about 1/2 to 2/3 the diameter of the trunks. They may have to grow several seasons, and run 3 to 6 feet, but this is the way you can get a plausible transition from trunk to main branch. Wire them so the first couple inches of the branches will be in position to create your target tree as in the drawing. You don't have to wire the whole length of the branches, since the bulk will be cut off in a couple years.
While you are letting the branches extend you can repot, and work the nebari some. I would not go to a smaller diameter pot, just to a shallower pot. You can re-use the nursery can, just cut it down to 4 or 5 inches. Then let the tree grow out for 2 or 3 seasons. Up here in the great cold north, it would take 3 years or so, but you have a much longer growing season, it might only take one or two years.
Then when you have the desired thickness to your primary branches, you can chop them back to lengths less than 2/3 rd the distance from the trunk to the first branch. At this time you can choose, and reduce the number of primary branches to just 2 or 3 per trunk. Massive back budding will ensue, select and grow out again. Its a slow process but 5 to 10 years from now it will be a dramatic change. "build a tree" is a slow systematic way to go, but the results will be superior to trying to force this into a show pot and show condition right from the nursery can.
Nice start, nice material, I'd be happy to have this on my bench as a long term project.