You also have to ask yourself, how strictly do they enforce those BS laws?
Sometimes laws are on the books but the cops are really unaware of them, or don't care, because, maybe they are cycle cops too and know what BS that law is and just ignore it??
id put it on and give it a shot, unless you did something stupid to get pulled over, and got an attitude or something to MAKE them now want to find stuff to rape you with, I don't think they'd know off the cuff it was not an 'authorized' attachment, given how many attachments, gizmo's and goodies there are for bikes that ARE authorized.
Just My Opinion.
Aaron