I was raised to speak (proper / homeland) English, so upon was engrained within my early vocabularium.
Now, living in North America for some time, it's become more of a personal preference, and as you were wise to point out, a matter of perceived agreeable dissonance.
To make it easy though, the resident desktop encyclo- offered me (you, us all) this definition for
upon:
Quote:
prep.
On. See Usage Note at on.
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