For the networking I found some repos with Nix and Gluetun (OCI containers). I don’t see them in my bookmarks, so it was probably a day project when I set up and didn’t keep the references.
That part is still in docker / podman. So any docker network guide just needs to be translated to nix.
There is anonymity and pseudonymity.
Do you need your opsec to be resistant to state-level actors (oppressive regime, censorship, illegal activities)? Well then you need to make sure you don’t introduce anything that will deanonomize you.
Are you trying to be resistant to mass data collection efforts used for profit? Being on the pseudonymity spectrum is a good step.
Dealing with the latter is like dealing with a bully. Make it not worth their time. They just want to put you in bucket X so they can estimate the most likely way to influence you for reason Y. Pseudonymity is about having multiple aliases that get put into different buckets so their privacy invasive efforts are less effective.