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Just buy a set of spacers and a couple of singlespeed cogs and convert the rear wheel.
It was in Brighton last year and quite a few of us from here rode, I don't recall anyone checking bikes, it was pretty much self policed. They've a Facebook page with more info if you've not seen it;
https://www.facebook.com/SSCXEC/
I really want to do it, but am going to be at a trade show with work the week before in Germany so will have to give it a miss.
Has anyone done SSCXEC or is anyone going to?
Would ziptie'ing a sram lever be a legit option to convert geared bike into a SS?