But one thing you can't ignore about all the advances in human history is that they've been on a relatively human-sized scale. Yeah, we've jumped a speed class or two recently but that's all on the backs of discovering increasingly denser sources of power (Oil, fuck yeah!). The speed of light, the size of the universe, and the energy to play around with these are in a class of their own.
Inherent into your question of if we'd want to meet aliens are a whole slew of assumptions that, themselves, are interesting. I would like to meet any of the aliens we have a chance of meeting - mainly little bacterium dudes on Mars or Europa.
To say that Aliens may be unconventional is like saying that they themselves could have come about by means other than evolution. Sure, they could have, but weighing the likely-hoods of them managing to become themselves without having evolved versus having evolved is akin to weighing the likelyhoods that they have found a way to doodle-around with the universe without first pushing through some of the conventional limitations of the universe. They could, but to accept this premise you must also accept that you're basically just shrugging and saying, "and I haven't even the faintest idea how."
Yes, such Aliens as you're imagining are possible, but the chances of them existing probably vanishingly small. And the likely-hood that we'd ever know about them is even smaller.
tl;dr yes, Aliens could do some cool shit if they found a way to harness larger and larger sources of energy. I would consider these "conventional" ways of solving the problems inherent in traversing the universe.
If you want to say they could just have some magical technology that utilizes laws we don't even know exist, let alone understand, it has to be coupled with the concession that the chances of this are vanishingly small. But that shouldn't be hard, because in an infinite universe the chances of everything are 1 and the chances that you'll observe them are 0.
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