Triomphe RD may work, as well.

53/39 gives you a wider range, but eats 4T more chain wrap than 52/42, which is smoother but can be a leg-puncher at times.

28-14=14, 53-39=14, so 28T chain wrap, which is pretty much easily wrapped by almost any RD.

Your issue is going to be the max cog clearance of the RD, of which 28T came in later than sooner for Campy.
As such, the Victory, Triomphe in that era, and many of later moderns, since you're using friction, will work.

Since chain wrap is not going to be an issue, even a NR may work with a $22 Roadlink that drops the cage 22mm.
Maybe just enough. Steel frames and Roadlinks are generally agreeable.

The only other noticeable issue may be the 14T outer cog. That may want to kiss that R seat stay a bit.
Not often an issue with freewheels. Often an issue with cassettes on road bike frames.

I do remember seeing a BF member riding a McLean that ran 14-28 rear, 52/42 front, all NR, and it sure didn't slow him down.