Just label it an "alternate" then and scrap the color rush. "Dear NFL - We're gonna make a blue alternate uniform with a red helmet and a throwback AFL uniform with a white standing bison helmet. Yours truly, The Buffalo Bills"
All it takes is a little creativity. I'm the end, it's not a huge deal, the Bills are gonna look great, regardless.
(P.S. - I'm aware it's an unpopular opinion, which is why I literally stated as such.)