I've been using a modification of this one for a few years.

- I placed the braces, brackets and parens under the same fingers in either hand.

- I placed 9 at the left of 7, for consistence.

- I switched shift position of colon and semicolon (I used to write a lot of Python in vim at the time).

- Some other minor changes.

This is how it looks like:

Unshifted:

  ${[(*+!=)]}%#
  :,.pyfgcrl/´
  aoeuidhtns-\
  ~'qjkxbmwvz

Shifted:

  `97531&02468¨
  ;<>PYFGCRL?@
  AOEUIDHTNS_|
  ^"QJKXBWVZ