I personally like the concept of only carrying one type of cable. But it's not as cost effective as some folks may believe. So I stock CMP and CMR, soon I will start stocking CMX if things keep going the way they are.
For the OP, several areas have adopted the CMP use only. It however is not a code issue, more along the lines of a local issue.
I would go ahead and run plenum. Up charge the customer but let them know why. If you have to re-bid then so be it. I don't think you want to go toe to toe with the EC or the inspector. I am not saying the EC is right, but you are going to want to make friends. Future work from the EC or GC or anyone is always a plus.
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