I probably have a spare Suntour that can handle that range. You can hang it on your Paramount for the cost of shipping.
Have you considered a triplizer for your Campy Record crankset? Many of us older and heavier folk rely upon them and I have one on my '71 P13. We're not all TdF racers! BF member @
jonwvara has them. I have a link on my freewheelspa.com website (bottom of the "Full Menu & Prices" tab and linked below).
In the picture above I was running my extreme mountain climbing gearing: 50-42-31 X 16-20-25-30-34-38 (currently have a more reasonable 13-16-20-26-30). My triplizer is an old one which is no longer made.
The one Jon Vara has is modeled after a TA version.