MIGHT be possible. What we do when tinting curved glass is shrink it to fit the outside, then transfer to the inside for install. This is done with a heat gun and a stiff squeegee. You slowly heat the tint until it shrinks, then squeeze it flat to the surface. With a good film, like Johnson, it could be done. Problem is, since the shield isn't glass, it would take almost all day to shrink the tint and not melt the shield.
I'll give it a shot tomorrow on a Concours shield and let you know how it goes.
"They will find the streets are guarded by United States Marines!"
2007 Vee with two round black things and a neat thingy on the right that makes it go faster!