You might achieve what you are wanting with an after market gas pedal. Many of the go faster places stock these pedals which are designed to variously look like drilled aluminium racing, carbon look etc. but are all attached by way of clipping over the std pedal. Often, they have the 'wing' piece that makes heel and toeing easier on come cars.

Will only increase thickness of pedal by 1/4' or so. Finding one with extra length shouldn't be a problem - most are long enough to hide the existing pedal face.

I don't know of one. And I don't know of anyplace that stocks pedals by their specifications.

If you REALLY want this, I would suggest frabicating your own at a machine shop. I would stick with steel. Aluminum and stainless tend to be brittle. And aluminum has a tendency to corrode.