As has been previously Studebaker did offer a sedate Avanti , unfortunately the competition offered a better product for that type of customer.
In the fall of 1963 our household had a new " sedate" Avanti and also a Buick Riviera, sorry but the Buick was a better vehicle. Smooth , quiet, powerful and with better seating area. Some, Avanti quirks such as a second gear start with the auto trans, engine cooling issues, and muffler's placed beneath the front seats which caused the interior to become very hot, issues that the competition did not have. These were small issues that Studebaker should have resolved before offering the car for sale.
My experience of trying to order a "spec " Avanti through the dealer network was terrible. I lived in the metropolitan New York area with established dealers who had no interest in ordering a Avanti. We bought our car from a dealer who had to trade to another dealer in order to get a Avanti. There was a 63 supercharged car that seemed to be passed from dealer to dealer for demo rides. I assume that this was a factory owned car that was in the region to support sales.
We bought the Avanti for $ 4,500.00 in October of 1963 ,and less than two months later the factory announced it was closing. The value of the car went to half six weeks after we bought it. That's okay , because I still own the car and have amortized my depreciation over the last 61 years.