Even though i doubt it, just in case anyone tries to make something work with the sample: 
I implemented it in unity as a test, just to realize that it's plain unusable. De/Serialization (to/from ScriptableObject assets) is enormously slow (20min. to load all packages +maps, meaning on every play/stop/editor load/scene change etc..), because of the high amount of classes with their extremely high amount of fields (alot of which are likely unnecessary, but who knows) and cross-references.
I tried to find a fast serializer that worked with undecorated classes, but couldn't find a working one. And i'm giving up on this idea.

In short: Using the sdk classes to extract the packages works but turns out to be waaay too performance heavy to be even remotely usable.
After trying numerous things, i also think the existing server may end up in the same situation the more extracted data gets included, if it continues to be worked on.
Sad, but that's what i can conclude now. But it seems like this doesn't matter anyway

I wish you all well
~Polymo