Datapoint: CSP --> Chase Freedom Visa
Converted my CSP to the original Chase Freedom Visa. It has the same 5x rotating categories w/ $1500 limit, but does not have the 3x at dining or drugstores (and obviously is a Visa).
The rep initially stated that the only card I could downgrade to was the Freedom Unlimited, which I already have; however, after mentioning that I wanted the "Freedom 5% Visa", the rep found it and proceeded with the downgrade. Interesting for anyone who wants to use the rotating categories on a Visa (ahem Costco), generate another Freedom Flex without drawing the ire of Chase, and/or protect their ability to earn the Freedom Flex SUB.