The Ristretto for iPad will carry your iPad and your Apple Wireless Keyboard in the Origami Case perfectly.
Please let me know if there is anything further I can do.
... based on those dimensions you gave it seems like your workstation would be just above the lip of the 10" Muzetto/Outback or Indy bag by an inch. The Muzetto/Outback flap closure will hide the extra inch, but the Indy does not have a flap and you won't be able to close the bag with the Workstation sticking out.
If you get an 11" Muzetto/Outback, your workstation will be deeper in the bag, but we only have one size for our Indy bag.
Hope this helps. Let me know if have any questions.