Yes, Montana works well. Except if you get hassled by a fussy LEO in CA, over the plate not matching your driver's license state.
I realize that many people do this with their high end cars/RVs, etc. (I have too) and never get hassled.
My CPA told me that the CA State Board of Equalization (AKA the Tax Man) isn't too happy about it, however.
I chose to register my Kirkham, my KR, and three of my pricey Brand X sports cars in CA. Paid the $$ and can thus rest easy. (Plus, then those cars are eligible for original CA YOM plates or the new black and yellows. I have both kinds.)