Thank you! I've been wanting to do this for a while for myself after becoming fed up with the verbosity of LaTex. My strategy has been a little different in that I've been working on plugging into equations using a Pandoc filter.
Instead of rolling my own or hacking into SymPy, I'll use asciimath.
Same here! It's been on my to-do list but I haven't gotten around to solving it in a robust manner (tried regexes just for kicks and they failed like I expected)...
Instead of rolling my own or hacking into SymPy, I'll use asciimath.