Keeping Vehicle Registered vs PNO? (CA Plates)

Hey all,

Our CA registration expires at the end of May.  We had planned on renewing the registration as a current vehicle registration has been used at all of the border crossings.  However, we received a notice of intent to suspend our registration on account of no USA insurance.

We sent the CA DMV our Mexican and Sanborns insurance papers but they have assured me that they are invalid for their purposes and we will have to file a PNO (Planned Non Operation).  Has anybody else used this method or figured out a way to keep it registered in CA?

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