If some of you go together and have your meringue powder recipes tested in a California approved food testing lab and it comes back as NPH then you should be able to present that info to your agency for review.
In Texas many items were tested and the info passed on with great results. The tests ran under $100 per recipe tested.
In speaking to the manufacturer of our brand (Genies Dream) he was surprised at the California ruling on mp as well.
Good luck to you all. Cottage Law is sometimes not totally thought out and is some cases meets lots of resistance from the health dept.