The easiest is to find a shimano MTB triple (or a sugino) and run them as a double. A lot of them were made and the prices are good. Those are 110/74 bcd which means you can run as small as a 34 on the inside or you can buy the nifty rings
nlerner has in post 5 and go 46/30. The sugino mighty tour (hard to find) is 110 bcd.
There are "modern" 110 bcd cranks that will look good on a vintage bike.
https://www.planetx.co.uk/i/q/CSHOCN...retro-crankset
If you want to stay vintage, you can also find an 86 bcd crank like a Stronglight 99 or an SR apex. That will let you go as low as 28. You can run them as a double or as a triple. Rings are available for them via Spa cycles in the UK. Plus the prices on those rings used don't tend to be bad because a lot of those cranks were made.
Or you could go with a TA cyclotourist (or the modern version of it sold by Velo Orange). These are pricey but you can run a 46/30.
IRD also makes a "wide" compact in 46/30.