Interface to use math alphabets from other math fonts

[u-fischer]

trafficstars

While it is rather easy (with \setmathfontface) to use glyphs from the latin range of another font it is quite difficult to access the \symXX ranges.

In https://tex.stackexchange.com/questions/438890/unicode-math-use-several-calligraphic-fonts-in-parallel Marcel Krüger shows some low-level code.

I wonder if an extension to setmathfontface would be possible so that e.g.

       \setmathfontface\mycal{Cambria Math}[range=up->symcal]

defines \mycal{abc} as \symcal with Cambria Math.

[wspr]

It's a logical idea! Thanks Ulrike, I'll try to take a look at some point.