CLOCK will help with decoding the entirety of K4, but the real key is in BERLIN.
Primarily in the relation TT has with IN.
Something critical happens with double letter sets that alters the alphabetical arrangement of cypher to solution.
TT is the sixth set of double letters.
BERLIN falls within the sixth sequence.
The second T is six letters off from N.
666 the cypher of the beast lmao!
Seriously though I spent about an hour playing with letters and numbers to find those coincidental 6’s so I have to share it even if just as a joke to ease my frustration 😛
And I do think that since, as you pointed out, the K’s line up, I have a hunch that perhaps the lettering changes somehow.
And something I noticed. In his first revelation he showed BERLIN over the K4 lettering. But with the CLOCK it’s actually shown replacing the K4 lettering, so could it be that the TT is a signal to switch the direction of the lettering… to explain, after TT you would go MZFPK = KCOLC.
This would explain why it starts with a question mark, if the first question (and if it is even a question) is actually backwards. Following that logic, by the time you reach the sixth set that contains TT, you would be going forwards for BERLIN’s segment, then backwards for CLOCK’s segment.
I messed with that thinking a bit and tried making some translations, but my piece of paper looks like something the zodiac killer would have laying around his apartment, nothing seemed to be panning out, and the inside of my brain feels even messier than the sheets of paper, so I need to sleep now.
Have fun, cause that’s all that really matters 🙂