I must admit I just gave up on all these tools. Instead I just do

    pip install -r requirements.txt -t .lib

and I have

    import sys
    import os

    sys.path.append(f"{os.getcwd()}/.lib")    

in the top of my script. Some will tell me this is silly, but it just works. Rememer to at .lib to your .gitignore. Else you'll have lot of fun.