Hmmm. Perhaps the manufacturers haven't caught up to your design ideas yet? The list you have given as to where you have searched is pretty much the go to list for us!

This is the look we NEED but we don't want stainless..

Have you looked at granite composition? Cleans up beautifully and doesn't stain. Google it. There are lots of websites out there.

Yes we have spent about four hours looking at granite composite sink sites. Lots of nice ones but no two that match in color and depth we need. We need a rectangle one and a round one that are the same depth or close.
We have an overall width opening of 37 1/2" and can go as deep as 24". We would like a minimum bowl depth of 81/2.