I've toyed with having a "Watch me Linux" stream where chat shouts out things they want to know about Linux and I show them / help people with their Linux problems.
I'd like to do some infrastructure streams where I play around with things like my Kubernetes cluster, unfortunately it seems like a pretty bad idea to livestream configuration of something that is connected to the internet.
I was going to set up a VirtualBox virtual network disconnected from the Internet to do this - perhaps only allowing HTTPS to a Debian/Ubuntu mirror if I need to install packages. You could do something similar for your Kubernetes cluster.
I was also considering a cheap, pay-by-the hour VPS that I could just destroy after the stream.