Hi iLB,
I know that you mentioned above that you think there will be a future 650b bike from Fairlight but when reading their website I think that the Faran frame would already be suitable for 650b wheels.
In the website design notes (
https://fairlightcycles.com/faran-concept-design-notes/?v=7516fd43adaa ) it says:-
"The other tyre (&wheel) size consideration was the 650×47 road plus standard, the logic being that a 650b wheel with a 47 tyre has the same overall diameter as a standard 700c road wheel with a 28-30 tyre. This is a great solution for adding further versatility to a bike of this nature so I wanted to make sure the Faran would be compatible with this standard."
I know that the stock options on their website come with 700c wheels but if you were interested in a Faran you could always ask Swift Cycles (
https://www.swiftcycles.co.uk/ ) about compatibility with 650b wheels and if you bought a frame from them maybe they could build you up a bike with 650b wheels.
Good luck with your decision making between bikes.
John