Two DR ratings per one armor?
I'd rather go with one armor bonus rating and one DR rating.
If you want, do not have armor bonus replace Class Defense bonus. Just use the better of two bonuses (this assume you are against stacking), with Dex modifier (up to the armor's Dex bonus cap) to upgrade your AC ... err, Defense value. Plus whatever modifier to enhance your Defense value. (dodge bonuses, deflection bonus, etc.)
Either Class Defense Bonus (IMHO, I don't like this term ... should be called Base Defense Bonus) or armor bonus, the DR still applies against any non-critical damage toward his WP.