Thanks for that - OK, I got it working with the 'latest' version of Kindle 8.51 etc. The solution was to use the BSTweaker file manager which was a new one to me. I then copied the map_data_storage.db file (which I could not see using BlueStacks own file manager even when rooted), imported that into the Calibre DDRM plugin, which it happily swallowed, and then copied the downloaded PRC file also into Calibre and voila! A readable and exportable book!
Thanks to all who helped with this.
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