Two other things that I forgot to mention. With the NYPVTT variables and the “BERLIN” clue, the Germans had a plane in WWII that was the JU-38. Well, the JU-38 is the nomenclature of the Morse Code pad, the device used to transmit Morse Code.
Also, when you do a straight Morse Code solution with NYPVTT and get CIATEST with the two – – at the end, you can go further with the two dashes.
DASH DASH = -…-…….-…-…….
That solves to: NERISREAEHI
Reversing the solution is: I HEAER SIREN
I am just putting that out there because it may mean something, or it may not mean something. :)
I don’t mind sharing the work I do on this code. If it helps to solve it, that is what matters.