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Technically they aren't Omnoms
Doh! That should have been obvious from the use of 130mm PCD. Moving a Powerspline to the right is the same as moving a square taper/ISIS/Octalink cartridge BB- it works as long as there's room for the NDS crank to miss the other chainstay and enough thread the allow the NDS "cup" to thread further in than normal.
Technically they aren't Omnoms... they are the cheaper S100 1.1 cranks, and a power spline bottom bracket. I'm not even sure how possible it is to space out the power spline BB, but I'll have a look this evening.
Custom dished chainring makes obvious sense on a bike that has so far cost a grand total of £140 including the cost of a couple of tools I was missing! :-)