This is typically accomplished by misaligning the hands but using the same finger motions as regular handflow.
Take frequent breaks from activities that require repetitive wrist and finger motions.
He hesitated, and she gave another seemingly random series of finger motions.
Even you were turned with a few finger motions, and the Count became a big bird with no trouble.
He can play at exceptionally fast speeds, and does a signature 3-finger walk (a "galloping" finger motion).
It's really no different from them learning the Suzuki method of violin or anything like that where they have repetitive, independent finger motion.
Mark's brooding silence and unconscious finger motions were nothing new.
Writer's cramps develop with repeated hand or finger motion, such as writing or typing.
He made finger motions to his mouth.
Many common letter combinations require awkward finger motions.