I've always felt that just learning the "right" fingering was a lot less trouble, and more reliable, than learning to play via transposition. It's like learning a new language (it IS learning a new language). If you have to speak it through some intermediate "translation" step, you're sunk. Don't learn some goofy trick that will just get in your way. I absolutely can't play trombone by trying to associate slide positions with valve combinations. I tried that, and it was miserable. Same for Eb vs. BBb tuba or Bb euphonium. At least that's my experience.
Gary Merrill
Wessex EEb Bass tuba (DW 3XL or 2XL)
Mack Brass Compensating Euph (DE N106, Euph J, J9 euph)
Amati Oval Euph (DE 104, Euph J, J6 euph)
1924 Buescher 3-valve Eb tuba (with std US receiver), Kelly 25
Schiller American Heritage 7B clone bass trombone (DE LB K/K10/112/14 Lexan, Brass Ark MV50R)
1947 Olds "Standard" trombone (Olds #3)