This is a partial re-asking of my question Can I change the font and colour of a letter permanently?. The answers there focussed on the colour aspect of what I wanted. I also want to be able to change the actual font used for a character.
What's the right way to reassign a character to a particular glyph from a particular font?
As a possible (albeit slightly manic) example, suppose I wanted (in maths mode) to use
C just for the set of complex numbers. So typing
C should produce ℂ. I also want to be able to shift the glyphs around, so maybe typing
d should produce δ.
Will's answer to my original question began with:
In regular latex you can choose different fonts for different symbols
but didn't tell me exactly how to do that!