Back in 2014/2015 I spent a lot of time traveling from Metro Orlando to the Tampa/St. Pete Area. Given that I-4 an FL 50 got old in the tooth fast I spent a lot of time crossing the Green Swamp on every route that I thought might be viable. Probably the least viable of the paved crossings was Rock Ridge Road and Green Pond Road in Polk County:
https://surewhynotnow.blogspot.com/2018/09/florida-friday-rock-ridge-road-and.html
Ironically Dean Still Road is a very good alternative surface route through the Green Swamp and I'm honestly surprised isn't signed as County Route 54.