I have the same wheels. Mine are gunmetal. Like yours as is but here's a pic of my Forgestar F14's. 18X11 and 18X9. What's your specs? ***Sorry for the blown up pic, my phone tends to do this....
that would be worth a try. try it out with some plastidip. just do one side and see how it looks. cost you like $20
ive seen those wheels in that brushed finish in person. its looks really nice. if it was mine id leave it as is or maybe experiment with some plastidip colors.