The same can be applied with larger units in the article, be it sentences or paragraphs.
Should the nouns after "be it" must be singular? Because the phrase is "it", then I guess they should be singular. But because "units" should be plural, then they should be plural as well. One solution is to change to "be they", but is it awkward? Or is using plural nouns after "be it" not noticed and acceptable?
She is damned if she does and damned if she don't.
We should use "doesn't" instead, but it will make the saying lost its rhythm. Would the rhythm overshadow the grammatical error?
In general, should grammar be tweaked to fit in a fixed phrasing?