Kindle for Android:
I acquired a copy of
com.amazon.kindle-4.16.0.75-1145045067-minAPI16.apk, installed it into BlueStacks 5, and signed in.
I was able download
this book (published February 10th), but then got this error:
But then I was able to read the eBook anyways.
And then I found these files in a asin-named subfolder in
/Android/data/com.amazon.kindle/files/
Not very familiar with Kindle files so I don't know if these would be usable.
Will also need to look up whether Android Debug Bridge can be used with Bluestacks