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Okay, first things first. They say when you go into set (approach and open), generally they're going to be thinking two things - "why are you speaking to me?" and "how long are you going to stay?". Apart from good body language and frame control and such, this is why False Time Constraints are important, along with follow-up stories and reasoning behind asking questions and getting feedback/opinions.
Also, you question the appropriateness of using opinion openers. Well, here's an example of how you could pull it off without rousing suspicion - say you're milling about, talking to some people you know, and some HBs are nearby. You leave the people you're with (quickly depending on how much AA you get), the approach and open with the opinion opener, something like "I've gotta get back in a sec, but we were just talking about _____, and was wondering what you think about _____. Because the thing is, _____". And obviously, you can keep it going if you have their attention. In their mind, they'll just think it was convenient to get someone else's input on something, as opposed to seeming like you're hitting on them.
People don't have to be known experts on topics for others to strike up a friendly conversation, especially when it comes to more subjective things you can discuss and debate. Basically, I'd recommend you go out and field test all kinds of openers for yourself, in this case questions and opinions, and see what kind of reactions you get. Might be different than you expect! Or it might not be so good, big deal. A lot of this process is personal trial-and-error.
Yes! See this is what I was thinking. There was one massive time where me and my mates were questioning whether a word existed (my mate said it did, I maintain it doesn't..."punce"= not a word, right? Ponce is the right word.) and there were some fine chicks nearby. This is the only situation where I thought it would have worked. But any of these day-game, on your own "Hey I was just wondering" stuff just seems like it's not going to work, just looks really unnatural and awkward.