I don't really find my Boox devices unstable although there are bugs. Android readers have Tachiyomi for reading off manga sites. It works well for that purpose and is constantly updated.
There's nothing really great that I know of to PUSH a book onto a Boox device (outside of the Kindle app), and unfortunately I don't think there's a way to sync progress with Neoreader and Calibre over USB even. There may be some Android apps that support that though, none I can think of. Right now I use Calibre-web over top my Calibre database as a web frontend and I can access my library anywhere through Firefox and download it that way. I've pinned my Calibre-web on to the homescreen for quick access.
Calibre-web does have Kobo integration and you can replace syncing to the Kobo store to your Calibre-web instance. I don't have a Kobo anymore so I can't really comment but you may want to test that on your Forma and if that works how you'd like get an Elipsa.
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