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PhilDAS-
I don't think you'd need to - Genesis specs the bike with a 1-1/8" fork and a ZS44 lower headset. The only difference being the Genesis fork has a wider (integrated) OD 47mm crown for a flush-fit with the ZS44 lower cup. Surly fork crown will be narrower (non-integrated) with the crown OD being narrower than the crown race - hence the visual step. AFAIK everything will work fine (bar the looks/step)
Alb
Trust me, it's a 44mm ID lower. No reducer required