If you're going to send out math as SVGs anyway, you can also just use your normal latex to PDF renderer (e.g. pdflatex) on each formula, and then convert the output PDFs to SVGs. That way, you get the same output you'd get with latex, and you can also use latex packages that aren't supported by MathJax (e.g. tikz-cd). I've prototyped a latex to html converter [1] based on that approach, but it's probably not ready for serious use. Here's an example: https://www.mbid.me/lcc-model/

[1] https://github.com/mbid/latex-to-html