Library Manager

Maybe this is unwise, but I'm posting in the Onyx forum even though I have a Likebook. There are more users here.

I'm looking for a simple eInk compatible library manager. I just want something with more sorting options and, hopefully, the ability to read Calibre tags.

I'm using KoReader and I can browse by tags in the search options, but that is a bit cumbersome. It would be great to have an independent app through which I could select a book and launch KoReader. I'm pretty married to KoReader. My Likebook is low spec, and all the other reader apps I tried were pretty awful.

I tried the demo of Calibre Companion, but it didn't seem to pick up my local book files. I also tried Renate's library app (which looked PERFECT), but it wasn't compatible with my Likebook sadly (installed, but crashed when trying to scan).

Thanks for any suggestions.