If you don’t setup or activate exit node, no traffic is routed through any of your nodes. All you have is the access to the nodes. Which is what you need. I tested exit nodes only recently, they’re very easy to setup as well, but I found no practical need for my use case.

I think installing and logging in should be trivial remotely. Like hey mum, install this app, and log in (trivial with Google or Apple accounts). The rest is on you. Just test the waters yourself first, you’ll get the idea, it’s pretty straightforward. Even if it’s not what you’re looking for, you’d have more information and skills to move to the next thing.