I currently have a touring bike with 36 spokes front and back, in the front with a SON 28, in the back with a Shimano Deore XT hub. I plan to switch my frame and I'm currently considering switching to a Pinion P 1.18 or C 1.12 gearbox with a Gates Carbon belt drive.
I thus researched what my options are for Pinion-specific single speed rear hubs, and Pinion itself only offers 32-hole rims. Also, the DT 240 are also 32-hole only. It currently looks as if my only option is a Deore XT or DT 540 Tandem hub with spacer rings to keep the rear sprocket in place. I've also found BMX-specific hubs, but I'm unsure if they are suitable for my needs, as I'm unsure if they have a freewheel ratchet mechanism.
Although I might change rims (26" -> 28"), it would end up silly having 36 spokes in the front and 32 spokes in the back. Do you know of any other options than standard hub + spacers? I should mention that I'd like to keep my 36-hole SON 28 and also not lace without using all holes, mainly because Roger Musson advises against that.