I can only advise on how I treated a Rescue Red Tail Boa about 5 years ago. Also no finances to take him to a VET.
It was a case of either I Rescue him, or he to be put in a freezer that night.
I set a Hot End of 33C, and a Cool End of 28C, at ground level. Ambient was tagged at 30C. Humidity at 70.
I Nebulised the snake twice a day with a very mild f10 solution, for twenty minutes.
He was cured within about 10 days, and is now a healthy breeder male.
How do you Nebulize a snake?
Get a polystyrene cooler box, make a small hole in the side just enough for a length of fish tank hose to fit through, on the inside, mount the nebulise container and face mask in an upright position. Attach the fish tank hose outside the Cooler Box, to the Nebulizing Machine. put the mild f10 solution in the Nebulizing Mask, inside the Cooler Box. Place the snake inside the Cooler Box, switch on the Nebulizing Machine, the Cooler Box fills with Vapour and Nebulizes the snake..
The only problem I see here is that I do not know what tolerance a Ball Python would have to such treatment, Red tail Boas are pretty robust and Bullet Proof.
Wait for replies to this, before trying this method.