[greenn]

This is applying a font for an entire window/frame/buffer, right? Not applying two fonts for different characters within the same buffer.

[brudgers]

So write some Lisp to do exactly what you want and package it up into a mode?

The alternative is shopping for a solution that does exactly what you want.

That’s another name for hiring a consultant.

[greenn]

I'm not sure emacs modes offer this level of extensibility, but I'll check them out.