Self-Host Omnivore: https://github.com/omnivore-app/omnivore/blob/main/self-host...
Use this proxy to point to the Self-Hosted instance to pull from Omnivore Instead. https://github.com/Podginator/KoboOmnivoreConverter
This is what I've been doing for a year or so now. I hope they don't remove the Kobo integration code from my Kobo.