I've worked with Fontconfig previously, and understand how to do most of the common configurations. All my aliases work as expected, and I'm almost completely finished. I'm trying to set the default unavailable font selection, and couldn't find anything helpful in any documentation. Countless Google searches returned unrelated results.
To clarify what I'm attempting to configure, how can I specify which font is selected in this circumstance?
fc-match 'nonexistent font'