Mercian can make you anything you want. I would skip the small wheels. A royal PITA. Your height is plenty big enough for 622=700c. But that is just me. Big tires shouldn't be a problem, but don't get too carried away. You could easily be disappointed in the sluggishness of the ride due to overly heavy wheels and tires. Also higher rolling resistance.

A fitter will determine the right measurements for exactly how you say you want to ride. Drops or whatever.