Free Nostr idea: create a nostr node that is text only and filters out any images to remain safe for work. It would be called tostr of course.
Discussion
Relays don't store images, just links, so you'd need a way to identify those as image links.
It would probably be easier to just have a setting at the client level where the client doesn't render images unless you click on them.
The goal is to have a client that can’t get you fired.
If you don't want to get fired, maybe you should be working instead of browsing Nostr.

What I love about capitalism is that you create a product and see if the market wants it. Not all products are for all people.