For me sand was unbelievably great, but seeing the pics and that you live in Florida. I'm not sure it will work. In order for sand to work you need sunlight and it must be able to drain. Given your location, the wetness, humidity, etc. I suggest trying a small area to see how it works if you do try it. Use paver sand, if I rmemebr correctly the brand at home depot has a bad inhalant and should not be used, lowes carries this brand which does not contain that
https://www.lowes.com/pd/Aspen-Mountain-0-5-cu-ft-Tan-Paver-Base-Sand/3726717
I believe the best solution suggested is building soil up whereever you want the chickens to be. With the rest, plant rice!