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I used to do this for work, repackage installs for automatic deployment. It’s probably not worth your time, but you’ll definitely learn a few things trying.

Here are more details written by people smarter than me: https://veilid.com/how-it-works/

Check out their discord!

I’m not conversant enough about it to give you an intelligent answer. I’m only a peripherally involved in supporting the project.

It works by distributing a database across multiple nodes, refreshing node database info automatically as needed. Beyond that is more technical than I’m really prepared to address and I’m not familiar with the technologies you mentioned; it just seems to check the boxes of E2EE, distribution, and privacy that OP seems to need.

Here are more details written by people smarter than me: https://veilid.com/how-it-works/

I should have placed my comment about veilid here. It might be the right fit for this use case. Look into the protocol and see if you agree.

It may be worth your time to have a chat with the veilid devs about using the veilid protocol to host all the files.