Well then - solution is simple. Set up a Euro company that does nothing but take private orders from Duncan to make Double Cream!
Seymour Duncan has more market share than DiMarzio because they spend their money on making pickups. Not on a permanently hired lawyer firm that contributes nothing to the products.
And the result of the lawyering doesn't hurt Seymour Duncan (obviously), it only restricts choice on part of the consumer.
It is worth pointing out that Gibson lost the PRS Lawsuit for trademark infringement. There's reason to believe that the same could happen to DMZ and the cream pickups.
For which trademark?
Just throwing other options out there: You can "age" the seymour duncan parchment color to a "fuller" cream shade by using Brown Kiwi leather polish (paste). It's not overly exaggerated like gibson p90 covers, but you get a nice comprise.
Like I said, not all there, but a decent compromise if you HAVE to have cream.