Just replace the breaker with a gfci breaker yourself. They literally pop in and out. Wait for a bright sunny day, kill the main supply breaker, and then remove the breaker panel bezel. Unscrew the conductors for your outlet, pop out the old breaker, and snap in the new. Then just go in reverse hooking stuff back up.
Running a still is 10 times more complicated than changing a breaker.
Heads up though, most gfci two pole breakers are $70-$120... I really should install one on mine.
"Woe to those who are heroes at drinking wine and champions at mixing drinks" - God (Isaiah 5:22)
So evidently, God wants us to drink our whiskeys single barrel and our Bourbons neat.