I do that one! Minus the avocado though as thats on the anaphylaxis list.That does sound really good. I used to make something similar but yours sounds easier to prepare and keep together when eating. Mine was English cucumber slices with a dollop of cream cheese and salmon on top, plus a small slice of avocado on top of that and a sprinkle of lemon pepper and fresh dill. But it had to be secured with a toothpick and even then it wasn't easy to keep it from sliding apart when popping into your mouth.
And without the lemon which sounds like it would be a big improvement!