Feets, don't fail me now?
The late Ken Uston wrote about keeping a separate count of aces seen by positioning his feet (apparently toe up, then toe down, then toe left, then toe right), using first one foot for the first four seen aces, then the other foot for the next four seen aces. As close to the clumsiest person alive, this didn't work well for me and I literally have to count upon my fingers.
Spread out your left hand. If you have made it this far in life with a complete set of digits, you will have four fingers, divided in thirds by the creases at the joints. At the beginning of a shoe, my thumb is not in contact. At the first ace I see, I place my thumb upon the innermost pad of my pinky. At the second seen ace, my thumb moves to same pad on my ring finger. At the third ace, my thumb moves to the same pad on my middle finger. The fourth ace, the first pad on my forefinger. At the fifth ace, my thumb goes to the middle pad of my pinky, and so on. After three decks worth of aces, I start again with the thirteenth ace seen upon the first pad of my pinky.
I sometimes will use the right hand to count aces, again starting with the pinky, handling chips with the less nimble left hand. If there is an interuption, as when chips are brought to the table for a fill, I can just remember the ace count by appending it to the Running Count ( say, 11 + 7 ) and do as I wish with my hands until play resumes. I use the same method while playing, or while watching a game being dealt. This has become automatic and I will know at any time the ace richness of the set of cards I am monitoring.
I use the same, no-think method at single deck, freeing my mental capacity to be alert for anomolies in the densities of other ranks. And I use these rank densities to augment my playing efficiency when I am aware of their implications for departing from basic strategy.
Perfect play is unobtainable, but I try, I try.