I like this! There have been several threads about Morse code, but taking it out of alphabetical order actually makes sense. Because there is a reason for the length (I suppose the most used letters are the shortest?) and because that way the placement itself in the memory palace gives you informtion (in the first room so it’s one sign long, etc.)
As a suggestion if you’re going to use it to communicate you should learn each letter and numbers by sound. Example the letter k is dah dit dah. I’m a Ham operator who learned the Morse code by sound and have used it for 50 plus years communicating with other Ham operators all over the world. As a benefit as you grow old it’s a great brain exercise. John