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There are some intriguing possibilities here, should you wish to develop.
While I am unaware of any public research on the BN communication protocol, it is self-documented.
Given this lack of public research, it is unclear what the protocol changeover will look like, or when it will happen. There is nothing in the current APK to suggest something beyond new SSL, new certificates, and possibly version checking.
There is a single URL in a SQLITE3 database which you can change to point the store to a resource of your own choosing.
Depending on how the new server implements version checking, you may be able to proxy requests to the server with a corrected version. If the proxy rejects the private key identifiers from the older devices, you'd have to link the account to a new device.
Implementing a new store would be possible, and not even significant effort.
However, given the fragility of everything described in this post, the easiest way of continuing to use the NST/G is to use the pipeline of rooted Android through Calibre and then usb.
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