Gazetter for offline use?

[Barry Hunter]

One of the apparent selling points is Plus Codes work offline. While that is true for full codes, the short codes its a bit more fuzzy, as will need a Gazetteer to resolve (or even lookup) placenames. 

Has anyone thought of creating a 'minimal' gazetteer for use offline?

In theory for creating short codes, could just find a place near the center of the grid created by 4 figure area codes (as the place name in effect replaces those first 4 (or 2!) figures ) - but while it would produce a technically functional Plus Code (it can be resolved), it might be using a not very recognisable place (there may be a closer town that makes more 'sense' to users).* 

For resolving short codes, its much harder, as may need a much more comprehensive list, as don't know what gazetteer the creator may of used. But in theory even so the usable placenames I  think would still form a rough grid. Many place names may well be unused as they too close to 'grid boundary' for example. 

Furthermore, may not need to store the full resolution lat/long, eg maybe just two decimal places would be enough. But even more interestingly maybe could just use Plus Codes to encode the location in the gazetteer (eg just storing the first 4 figures of the Plus Code? although for better encoding might use 6 for example) 

Guess would never be able to build a 100% reliable dataset for decoding, as even 

https://github.com/google/open-location-code/wiki/Guidance-for-shortening-codes

says, could be creating a short code with a River or a mountain name, ... but could perhaps build a reasonable dataset, that covers most areas? 

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* eg  "5R4R+H3 Uxbridge, UK" is technically resolvable. But its a code for Gatwick Airport, which Uxbridge doesn't make sense. Uxbridge, just chosen as roughly central to 9C3X0000+