Go with the trenching.
Improve the land and your plant choices get larger. That extra dirt adding a new height and dry spots to plant open up a whole lot of choices for you. . While you are digging, you can get the land to drain better also.
Other choice is a pickup truck size load of sandy soil dropped on one spot and the higher ground is now a much better spot for fruit trees. Raising the land is going to be easier than finding something good to eat you can grow under water,
Lots of water in Florida. Quite common to see a grove planted on ground that had to be improved before planting.
Water logged will grow you pond plants and thats about it. I was looking at a flooded longan grove not long ago. It had been done this way and the grove was loaded with fruit. Flooded every year but was up high enough to live and thrive I might add.
Trenching will add more different types of fruit you can grow. Flying Fox nursery is using pond apple for a root stock, he may be the one you want to talk with.