Sounds like a RAW is the best method to check these, though perhaps snotice is... I don't deal with ircop stuff. But, whichever event you use, you can just do:
if ($len($1) == 12 && $1 isin $5) { kline command }
Note that $1 and $5 would be changed if those aren't the first and 5th "word" in the event. I'm using the one you displayed, where the first "word" is the nick and the fifth is the name.
