Hi, before accepting, please read: would it be sufficient to create a script, which you can run after installing the initial OS (e.g. Stretch), which will set up everything from scratch?
Best, Christian
Edit: I might even manage to create an image and upload it, so you can install it onto your sd-card with etcher
Edit2: Ok, got it up and running, just need to resize the image and then I could upload it (which might take a while)