A software platform that makes it nearly impossible for Beehaw to host, in any way, CSAM.
I hate to say it, but you’ll need to find a text-only platform. Allowing any image uploads opens the door to things like this.
Besides that, if your concern is that no moderator should be exposed to anything like that, well on a text-only site you might have to deal with disguised spam links to gore, scam, etc. You’ll still have to click on links to effectively moderate.
Maybe you should consider if this is a position that you want to put yourself in again. It sounds like this may just not be for you.