Tie up some beadeye shrimp with a blond craft fur wing spotted with gray pantone and grizzy hackle palmered under the wing. I tied my eyes on the bend, and used microfibbet antennae. This fly worked for me on Bahia Honda.
Felt crab are easy and very effective too although the merkins ride better in the water due to lack of planing effect there is no difference in crawl retrieves.
Throw a couple of good pilchard patterns in the box too - although I was too chicken to cast, huge tarpon were busting the pilchards off the edge of the flats.
If you can find the american wire co. steel leader it's the easiest to tie knots with, I'd guess 17# would be the best match for the leaders you will likely have on. Might have to replace the tippet after using the wire cuda condom.
I will make a call re: meeting our Keys correspondent today, will keep you posted.