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Not sure, TBH. I've never build a 24h rear wheel with a shallow rim - the shallowest rim I've used myself on a 24h rear wheel with CX-Rays is a Kinlin XR31T which is pretty stiff. I suspect you'd be fine with CX-Rays, but I'd defer to more experienced wheel builders.
I built @Cycliste a rear wheel using an XR200 rim, which is light and quite floppy, and used CX-Rays on that but I used 28 spokes on the rear despite @Cycliste's feathery lightweightness. That was fine until a 6'1" chap called Alan rode over it after @Cycliste had gone over the handlebars. Wasn't so happy after that.
Yes was planning on 2x all round. For strength and I prefer the aesthetics. So do you think for a light rider I'll need stiffer spokes than cx rays on the rear for 24 holes?