I would suggest use python. But now the only problem is the memory overhead right? So I have great idea for people who may be stuck in this problem later on.
First thing's first, write a bf interpreter(or just get source code from somewhere). The interpreter will be really small. Also bf is a Turing complete language. Now you need to write your code in python and then transpiler it to bf using bfpy( https://github.com/felko/bfpy/blob/master/README.md ). I've given you the solution with the least overhead and I am pretty sure a bf interpreter will easily stay under 10KB of ram usage.
