I’m only just now trying to take in the Morse code subject matter. This would be a bias based on my findings, but I’d like to point out that my take on the X and Q found at the front and back end of the “Can you see anything” phrase in K3 is Sanborn’s way of suggesting a keyword that starts with Q and ends with X. Caesar shifted, Q/R and X/Y. Could the Morse code “RQ” be the primitive insight needed to suggest a Caesar shift?
Perhaps each of the Morse segments offer an insight into each step of the puzzle. All those E’s suggest to me a background space that is all E’s and like a palimpsest, some other letters are written instead to form those new words. Is the order of the Morse important, that is does the layout suggest the E’s portion comes first and the last part involves SOS followed by RQ?
