I am not sure about the building codes where you are from, and I may have misunderstood your post, but where I come from a simple solution would be to use deck blocks.
If the ground is older (not new contruction) it wont settle too much (where I am from anyways) and if you dig down 6-8 inches and put down some good base gravel and tamp it, put the deck blocks on top of it. You can even get adjustable deck savers (think small telepost like in the basement) it will allow you to adjust the post height if the house or deck shifts).
With the deck free floating it will move as a unit and seperate from the house if it does move at all. If it does, adjust the deck savers and DONE.
Check with your local building dudes, but up here those are acceptable (and work great) on a lower level deck. If the deck is higher like 6' or more I would not use them.
If you can, it is much cheaper and easier (and should get the job done).
But like I mentioned earlier, check with the building officials.