I don't see how this violates the concept of device independence.
.apnx is Kindle (series) specific. Other formats are device (compatible) specific.
So including a APNX file and sending it to compatible devices seems no different than the ability to send OPF and JPG to others.
Drivers will need touch-up for this to happen
The big questions: What file (format) is the APNX paired with in the Library?
How to maintain-assure proper pairing?
my 2 cents
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