I wouldn't "mix" any powder with anything! That could get "iffy" real quick!
As far as the plastic powder measure is concerned, the static issue is not an issue. Look what your powder comes in - a plastic container! Static will not build inside a plastic container, it builds on the outside. Plastic hoppers on powder measures are made from static resistant materials anyway. Besides, even if you did somehow manage to generate a spark, it would never be big enough or hot enough to ignite anything, that's been proven over and over.
I personally use an old Belding and Mull, which is made of brass, but only because it looks nice and is very accurate. I use a Lyman #55 for loading pistol cartridges with black powder, and not the aluminum hopper version either. I think the brass and aluminum hopper business is just something to get you to spend more money!