OMG Thank you so much.
Sometimes you are just not looking at the hole picture and focusing to much on one solution.
The worst part is that i was allready using the custom meta box with custom fields in it, I just forgot that the method i was using to generate the HTML field was a method i have made myself – so GG ^^
Thank you for your help 🙂
I would add the custom fields to a custom meta box.
with some code like this
https://gist.github.com/KasperFranz/5b8c075616e0f2556028
(just an example of how i could add a new meta box with custom fields)
Would you make the meta box as an array instead and then post it? (and collect it with the callback?