Cannot compile Myriad Pro with FontPro

My goal is to use Myriad Pro (+ MdSymbol) as math fonts.

Currently, I am using a setup based on mathspec, but I am not happy with the glyph bounds.
For example, the f in $f(x)$ collides with the opening bracket, and always using $"f(x)$ is kind of annoying.

I saw that there is the tool FontPro (https://github.com/sebschub/FontPro) that compiles a MyriadPro package.
However, trying to build the package results in

! install... error:
        Font/MTX file MyriadPro-BoldIt-integral not found.

after some time. (Earlier parts of the script for the regular and italic font seem to succeed.)
I am trying to build using TeXLive 2020 and Debian Buster WSL on Windows.

I am unsure whether the problem is the build environment or my input files (the .otf files for Myriad Pro).
Unfortunately, FontPro does not seem to be maintained anymore.

Has anyone recently succeeded in building a font with FontPro?