Here is a link to the PPE pipes for the F150, as you can see they state the cats used will keep the CEL off, however still no guarantee that you pass a readiness check (though if the CEL is not set then you should be in ready state)
http://www.ppeengineering-onlinestore.com/Ford-F150-Ecoboost-V6-25-3-High-flow-Cats-130005.htm
Another option, would be to purchase a more efficient catalytic converter (such as what PPE uses) and swap that in to the current pipes (possibly with flanges to allow for you remove the cats and add straight pipe once you have passed inspection)
Further option, would be to try and find a used set of OEM pipes, from someone that has upgraded and does not need them, and swap those in, then swap back to the LME pipes after.
http://www.ppeengineering-onlinestore.com/Ford-F150-Ecoboost-V6-25-3-High-flow-Cats-130005.htm
Another option, would be to purchase a more efficient catalytic converter (such as what PPE uses) and swap that in to the current pipes (possibly with flanges to allow for you remove the cats and add straight pipe once you have passed inspection)
Further option, would be to try and find a used set of OEM pipes, from someone that has upgraded and does not need them, and swap those in, then swap back to the LME pipes after.