I use my kindle oasis 2 with exclusively sideloaded books. I load what I want through Calibre (my books are in the old MOBI format, but you will probably want to use the more advanced AZW3 format). I don't use collections and none of my books sync with any other device or kindle app. I use a metadata plugboard in Calibre to put the series name in the title on any book that is sent to my kindle (it ends up Series 01 - Title) to make it easier for me to read a series in order. The indexing can be a bit of a drain on the battery, but shouldn't be too bad if you don't load hundreds of books at once.
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