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Ok you approach the target from behind, tap her on the sholder and be like hey *random girls name*. when she turns around be like "oh sorry i thought you where my friend *random girls name*, she's wearing the exact sam dress/skirt etc as you. Then say i needed her advice but i guess you can help instead.... throw ftc and do an opinion opener.
My theory behind this is you are flicking the preselection switch by letting her believe you thought shwe was your female friend. You are then negging her by saying your friend is wearing the same dress as her (girls hate when this happens).
I'm going to try it out this weekend and see how it goes... If anyone else wants to field test it too feel free... please report back though

I've heard of the mistaken identity opener too but it's done a little differently. I just want to say that approaching a girl from behind is kind of creepy and it's not as comfortable as when someone approaches you over the shoulder or at more of an angle. I can't remember exactly how the mistaken identity opener goes but it involves a wing.
You can always flip the preselection switch in an opener by mentioning a past girlfriend. For example I use a myspace opinion opener where I say, "Let me get your opinion on something...false time constraint of choice...Would you ever date someone you met on myspace?" "The reason I ask is my past girlfriend xxxx and I were talking because this guy messaged her on myspace about a week ago. They got to know each other and he wants to take her out...."
I do like the use of your creativity with the opener, the dhv spike, and the neg all rolled into one. I think you are on the right track but I just don't typically recommend opening people from behind its a little weird for her, and just isn't as comfortable.