in a standalone C++ program (for windows only) I want to call python scripts in a separate process.

I have the following requirements:

1. The user should not have to install python to run the C++ main-program.
2. all python dependencies are provided with the installation of the main program
3. Based on user input, the C++ program would call different scripts for different tasks.
4. Scripts are standalone and communicate over ZeroMQ with the main process (therefore, I would like to pass an address and a port to the python script, in the moment of calling it)
5. The python scripts are currently organized as PDM Packages. This is great for development, I would love to keep that
6. Since I would like to keep some parts of my python script closed source, a big benefit would be to deliver my scripts in a closed format.

How would I achieve this in an elegant and secure way?

I would like to avoid shell-based approaches like exec(), system() or popen() because of security reasons, or is it ok to use these?