I gave up trying to feed f/t to my ball pythons. They are just too weird in feeding. I know some keepers have gotten them onto f/t, but it usually took a lot of warmed mice, playing "cat and mouse", and a lot of wasted f/t rodents.
I have about 3 dozen or so balls, mostly around 2 - 4 years old. I did try the f/t feedings for a while, but just couldn't spend the time and money to occasionally get a couple to eat a f/t rodent, and throw the rest away.
I know other breeders who also feed live for the same reason. So far, after a couple of years, I have never had a problem with live. But of course, I don't leave them very long unattended either. It is a risk, but a very small risk. BPs are just not like corns, or even boas or many other pythons. They go on and off feed for months at a time, even under perfect conditions and with live rodents. With f/t, it seems they are even more unpredictable.
For now, you could always offer a rat that is too young to defend itself. Then you won't have to worry about the safety issue until the snake is bigger. Maybe by then you can get it onto f/t. As also mentioned, you can try other animals that can't defend themselves as well, such as chicks or baby rabbits. But I have noticed that BPs often seem to prefer mice (or maybe those African Soft Furred Rats - just got some of those myself.)
Good luck whatever you decide.