Rust is rust. You can slow it, but without compelte sheet metal replacement you cant eliminate the progression of the rust. One of my best freinds is a bodyman. He will be the first to tell, buy another tub. Because the money you paid him to do all the rust repair will pay for the new tub.
I've seen a lot of rusty jeeps, and I've never seen a YJ with rotten rockers that didnt have rust on the floor.
To functionally replace all the sheet metal that is likely rusted out in that thing, you are looking at a very hefty bill.
Cover it until you decide down the road you want to do a resto project, at which point you spend the 2500$ on a completely new tub. The 400$ you spent on cockers gets re used and put on your new tub. The 3000-5000$ you spent in rust repair would end up in the scrap yard.
By the way, the rockers will last longer then the rest of the jeep. You havnt a hope in hell of rotting out new, coated, 3/16's plate before the rest of that jeep tub completely disintergrates.
Good luck