Ooooooooo!
Reflection from mirrored vinyl is asking for trouble!
I would not print that on my printer! Not to mention UV inks are more "brittle" / hard when they are cured.
I say just because you CAN does not mean you SHOULD.
this is the only way i can see this working. spring for the optically clear stuff too.Reverse print to clear and apply that on window first then apply mirrored film over that? More steps/cost but seems like it would do the trick.