I'd look for something 650b sized, or that will take 650b wheels Eg an XS https://www.wiggle.co.uk/kona-rove-al-650-gravel-bike-2021
Surely a 650b gravel bike is going to have the same frame compromises as a 700c road bike, as they both need to accommodate similar outer diameter tyres?
@grams started
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I'd look for something 650b sized, or that will take 650b wheels
Eg an XS https://www.wiggle.co.uk/kona-rove-al-650-gravel-bike-2021