The smallest width I have seen with large Flair so far is 360 on the top.
But I can't tell about the quality of Ryet.
https://a.aliexpress.com/_EQVJoQFCockpits smaller than 360 are really rare. I've only seen some for road with no Flair at all or only 20mm more width in the drops. If that's acceptable there are some 340mm Cockpits.. Lexon does have one, Ullicyc has one and if I remember correct Airwolf had also a 340.
My Lexon shopping experience was not the greatest by the way.. if it was not for the geometry of the handlebar I would have sent also the second handlebar back. The first one was out of spec and couldn't be even mounted on the fork...