Correct typo in paper title?
You could ask, although it's likely the publisher will be reluctant to make changes, for the reasons you mentioned: it creates a discrepancy between the different versions of the paper.

I'd honestly not worry too much about it. Yes the typo in such a visible place is embarrassing, but hardly unique. It doesn't threaten the veracity of the paper's results, and readers learn to ignore typos (lots of papers have typos!). If there ever is a "second edition" of the paper then yeah, correct it, but otherwise it's just not worth the effort.