That looks great, Lojack. In answer to your earlier question, your regex will work. You might want to just look for "TES4Edit" when checking if it should be cleaned though, as someone mentioned using "Clean with TES4Edit" as a possible opener, and I haven't decided which to use - the one constant is that the "should clean" message will mention TES4Edit, while the "do not clean" message will not, so that's probably the safest thing to look for.

EDIT: IIRC the only things that the standard UDR and ITM cleaning doesn't cover is wild edits - if such information could be included in BOSS's messages, then having Bash pick up on that would be good too. Of course, that relies on my thinking up a standard message format for that info. I will have a think, but it's not such a big deal since there's no (AFAIK) place such details on wild edits are stored, so inclusion of that information would be slow going anyway, requiring re-checking of all mods reported with wild edits.
I think what you've got so far is plenty for now, if I do think of anything then it can always be added in later, post 292. The UI isn't going to be affected by any such additions, after all.