How to Organize New User Content?

What would be the level of effort to implement one of these two solutions from the OP?

(2) A tag could automatically be appended for topics created by certain trust levels. For example, a topic from a TL2 user would get the #tl1 tag. (To keep things simple, there would be nothing special about the tag, and the user could remove it if they wanted)

(4) The ability to mute Topics based on OP Trust Level, e.g. < TL2

The latter sounds cleaner from an UX perspective but like more work.

The former sounds like it might be really simple based on something like this snippet and introduce less complexity to the platform. Would this be pretty easy to do?

One of these, combined with giving tags full mutability would be a good solution to managing these posts from new users.