In case anyone wonders what happened to Kobo Deluxe, it has been replaced by Kobo Redux, which has been available on itch.io for a while.
Further, Kobo Redux was Greenlit recently. However, there are legal issues preventing the current version from going on Steam, and technical reasons why substantial refactoring is needed. To deal with these problems, I've decided to remove the offending code, and replace it, part with new C++ code, part with EEL script.
As a bonus of pulling in EEL, I'll be able to grab the GUI, input configuration dialogs and whatnot from Kobo II, and also make the game more accessible for modding.