This is great, thanks for sharing! You’ve got a few useful feedback points, let me add one more: does a provider have an onion address. This allows decoupling of payment from usage. Not a big thing, but good to know.

I vaguely remember some issues with extensions in ungoogled chromium. Maybe I should give it another shot.

Depends on what you mean by “private”. I would not trust it much, but it’s not a bad Chromium based browser when you need one. Use something like LibreWolf for much more privacy out of the box.

An outdoor WiFi access point would help with garden coverage