so you've found a person you want to make a first step in forming a genuine human connection with, Congrats.
personally i don't think you should try to mask your nature in an interaction like this, because long term they will end up seeing you anyway.
also "small talk" has two primary functions - one is to allow people who have no interest or reason to interact the ability to participate in a social engagement. this function is boring and useless, and can be met the same way as the other function.
the other is to maintain a long term relationship with someone when you don't have many common interests. this function is better served by finding something you can find interesting among the other persons' interests.

you should know what it is about them that made you interested in wanting to approach them. ie. they are wearing a band shirt of a band you also like, they have cool hair, they have mentioned xyz thing, etc.
so just approach and say something like "oh xyz thing, I'm into that too, what do you think about zyx(related thing to xyz)?"
remember they are able to read vibes just as you are, so they might just shut you down this is fine. move on, try to understand why if you want. or don't.
or they might start talking about it. if they do, just follow the thread. congrats you did it.