What did you find hard about sideloading on the Kobo? I've had a Clara and now a Libra, sideloading books is as easy as plugging in a USB cable and clicking and dragging files onto it like it's a usb stick.
It's optional, but you can use Calibre with an extension to convert epub to kepub as well.
m463|1 year ago
Otherwise you had to create an account and log in and blah blah.
faaarmer|1 year ago