Depending on what style your own glasses are, clip-ons may not even work or attach properly. You can find fairly inexpensive glasses online that come in a wide range of crazy styles (his is certainly not the most difficult to find) and are prescription. I would recommend just getting a new pair through that if you can afford it or get insurance to pay for some/all of it.
Also from the show itself the lenses just looked black to me, I think the red may be just an effect for the ad but maybe I'm wrong, I did only watch the first episode.
As for a blind cane I'm sure you can just Google medical suppliers and find one, or locate a local shop, or hell even make your own using a dowel. As for how bad it'll make you look, I can't really say. I have seen plenty of Homestuck cosplayers doing some character that uses one, and another con-goer who was someone else (or maybe was just actually blind). I don't think they really get any in-person flak for it.
If you bring it with you I'd make sure to make it evident you're not actually using it unless you're posing/in a cosplay group. Otherwise you might trip people up who are trying to go around you or make room for you. The biggest worry though is confusing drivers, so if you're ever outside the convention center I'd carry it up under your arm rather than walking with it like a blind person would.
Radcon-'12 : Akicon-'13 (not returning) : KuroNekoCon-many years ago : Sakuracon-'13, '14, '15 : PAX Prime-'11, '12, '13, '14, '15 : Rainfurrest '15