Is there any way, other than 3rd Party Storage via the API, to embed an Excel Spreadsheet in a part file and then drive cells on the worksheet from the model?  I know that you can do this to a very limited extent with a design table by using redundant driven dimensions, but this will not allow for all the functionality I need. 

It seems like it would have been SO easy for the software development team at SW to allow worksheet pages in the embedded design table Excel object to work the other way, and be driven by the model.  This would allow for tremendous  automation of analytical calcs, as well as costing.

So far, I can find no one who has developed an Add-In to accomplish this, and I am wondering how difficult of an API task this would be.