You're a lifesaver! None of my clients have actually deleted the template, but for whatever reason two of my clients have a weird issue where a new default kit is generated and then applied, so the site resets to default styles. The old/original default kits are in there, so updating this wp_options value put the sites right back to normal!

I've been going in manually and recreating the theme styles every time this happens. This is going to save me HOURS.

Thank you, thank you!