Is there a "dumb" kindle-compat. android reader?

In My Humble Opinion (IMHO)
#21

Here you go:

https://support.google.com/googleplay/answer/6270602?hl=en

#22

If you do go for the Pro version, there is a free PDF plug-in here.

#23

I second this
Formerly i used Aldiko

I also second calibre on PC to manage and convert etc

#24

Thank you most kindly! I’ll wait till this weekend so I can spend some time on it, and I’ll try to make this all come together the way I want!