Timed delivery of content to different user groups

[mjmare]

I'd like to pick your brain on how to solve the following problem with Wagtail:

In our clinic we have groups of patients that go through a series of treatments. Related to each treatment session I want to provide the patients of a group with access to some documents (but not all).

So:
Each group has a different schedule.
Each session in a schedule requires access to certain set of documents.

What would be a Wagtail way of realizing this?
My initial idea would be to use regular user groups and users. Then create a custom classes for schedule and for document sets.
The Wagtail scheduled publication seems not so useful in my case. And I'm not sure about the use of regular Django/Wagtail users and groups.

Thanks in advance for any input.

Marcel