I have a solution for this.

Write a bash script for MacOS on your Windows Machine that goes into your python project, installs dependencies, including PyInstaller, and then compile.

You can ship your project with the bash script and the Mac User just has to run the script as an executable. Essentially automatically compiling on their machine.

Though there could be some problems where the user may have to manually download Hombrew or Python3, because MacOS is funny like that.