I shopped around quite a bit and eventually decided that s7 scheme[1] would be the best for me. It's been fairly painless to integrate so far, I've just copy-pasted the function prototypes I've needed, as I've needed them. No macros. Engine is closed-source atm so I can't show code, but it's a pretty straight translation from the c examples.

1: https://ccrma.stanford.edu/software/snd/snd/s7.html