Had an interesting response from Amazon.
They advise that, assuming a fresh install, I may be able to move Kindle reader App (3.3.x) to MicroSD and then both App and data will reside on MicroSD (and if that is full start to occupy installed memory).
I'll do a factory reset on Viewsonic 7e (after a full backup) the migrate all possible apps to MicroSD (checking version of factory installed Kindle App and removing it if it is less than 3.3x).
I'll update thread with the results.
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