Register content plugins when creating a content module

[Guido]

Vague title, I know. But what I mean is this:

When you create a normal content module, that keeps track of items, could I, in the same module register a plugin that can be used in a template to create a content block in the backend page editor screen?

In my case, I want to make a module named 'dishes' that can be used to keep track of dishes (I know, could use LISE for this but I want to be able to re-order items within categories and filter by showing only these categories) and give the user a block with a drag 'n drop sortable list based on the categories. Final use would be one module where you can keep track of dishes, show only a certain category and re-order within this category and then, allow a content plugin in the menu-page template to create a content block where the menu categories can be selected from 'all available' and sorted for this specific page.