Yeah Alaska plates are fairly rare so you could maybe get away with them not adopting the standard. Hawaii plates are EXTREMELY rare because of the cost of freighting a car over and there's no real reason to register a car in Hawaii that I'm aware of. [0]

[0] I'm thinking here of places like Montana which attracts a fair number of out of state registrations to avoid sales and registration taxes in some states. PS don't try this most states already consider this and you're often violating the sales tax laws if the car doesn't leave the state within a few days of purchase.