"Hindu trinity [...] an alternative way of looking at it"

There's one problem with Vishnu interpreted the way you do -- he does not manifest, he preserves what is already created, and that out and inbreathing is, indeed, that of Brahman (not Brahma). Although, you will also find day and night of Brahma (not Brahman), he lives only for the duration of one breath. So, that's that.

But yes, you probably won't find a literal equivalent to Hindu trinity in other traditions. But also bear in mind, that, thanks to Vedic chant, Vedic tradition is one of the oldest preserved oral traditions on Earth, and the oldest one that is known to be preserved to a T.

So, it's not that surprising that you may find some fragments in Zoroastrianism, some in Judaism (and Abrahamic tradition at large), and some only in Hinduism. The closest, most probably independent, tradition is Taoism and, frankly, that one very much feels/reads like a lean and mean version of Vedic ideas.

"the positioning of the separation of the text [...] might suggest there is only one creation story."

Which, IMO, there is. At least the actual process which the stories try to describe was/is only one.