Here's a file for those who were using my version with added Rakuten Sans/Serif support for the fonts dialog.
There's some weirdness with font availability between different Kobo versions - Caecila, Gill Sans, and Malabar are
not available on Clara2E. Just remember not to use them if you don't have it available (though I suspect it'd just revert to default font).
EDIT: Removed attachment because it was released