Import a single letter from a different font (and use it in text mode)

Question

There are many questions about import symbols form other packages to use them in math mode. But there is nothing about import symbols (letters) from other font families and use them in the text.

In particular, I was wondering if I can import single character to use it in a particular shape. For example, if I can import the italic z from Times New Roman and use it with the TeX Gyre Termes font. Or another example: I don't like the italic f from the millennial package and I want to replace it from the italic f of computer modern font. In this case I would also replace the symbols fi, ff and ffi to get the correct ligatures.

My question is: is it possible? For example, from this question I know I can change the z used in the math mode with the code \AtBeginDocument{\mathcode'v=\varv}. Is there something similar for text? For example something like \AtBeginDocument{\textitaliccode'z=\varz}?

Thanks

in luatex yes as you can make virtual fonts on the fly but for classic tex or xetex, you would need to make a virtual font from the two base fonts, otherwise any code would be equivalent to \textsf{z}oo but the font change woul dbreak any inter-letter kerns and disable hyphenation. — David Carlisle, Jan 01 '19 at 22:04
You say LuaTeX. Is the same option avaible for LuaLaTeX? I say this because I suppose it would be closer to the usual pdfLaTeX or XeLaTeX. — Dog_69, Jan 01 '19 at 22:14
See https://tex.stackexchange.com/questions/371647/call-a-luatex-combo-font-through-nfss — Ulrike Fischer, Jan 01 '19 at 23:34
yes font access is a feature of the engine, not the macro package. — David Carlisle, Jan 01 '19 at 23:35
There are a few packages that define virtual fonts, but in practical use, you'd probably do something like \DeclareRobustCommand\itz{{\timesfamily\itshape z}}. — Davislor, Jan 02 '19 at 00:44
@Davislor I would like to write simply z, without any command like you say. Would it be possible? — Dog_69, Jan 02 '19 at 10:31
See also fonts - Replace a single letter in xelatex - TeX - LaTeX Stack Exchange — user202729, Jan 03 '22 at 02:00

Import a single letter from a different font (and use it in text mode)

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