For things like PPAs, (eventually) bikesheds, ISVs and so on - we should support archives which are "on top" of suites we already know about.

I think the problem here is mainly about stock icons?

The workflow should make it easy for both the central instance and random external instances to operate in this mode - the former for PPAs and the latter for ISVs. Maybe this is the same though - acquire the preprocessed data either by downloading it or having it on the filesystem, generate a configuration, and run.