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i can imagine spokes changing their angle to the hub and nipples ,when the hub is stopped and the rest of the wheel is trying to continue rotating because its under load.
hence a 2 cross would come near to a tangential angle when braking,in 3cross spokes would end in an angle over tangential,beeing bent due to that,not pulled only.
in this i assume you got a hub flange over 45mm diameter and a rim under 510mm e.r.d.(most 24 inch dirt,street,trials combos except the ones with assymetrical flanges???)
isitafox,give it a try,dt has 28 disc enduro wheels and they work.