Hi tully1254,
Short answer: no — there is still no native feature for that combination. Footnotes are laid out inside the same text frame as the body text and follow that frame's columns, and Type > Document Footnote Options offers no separate column count just for the footnote area.
The only related built-in layout option works in the opposite direction: "Span footnotes across columns" (Document Footnote Options > Layout) lets footnotes in a multi-column frame run across the full frame width instead of sitting at the bottom of one column. It cannot split the footnotes of a one-column frame into two columns.
So for one-column text with two-column footnotes, your current script approach — detaching the footnotes into a separate two-column frame — is still the way to do it.
Official details: https://helpx.adobe.com/indesign/desktop/indexes-and-references/footnotes-and-endnotes/span-footnotes.html
Hope that saves you some hunting!