I would forget the OE inspection lamp sockets and fit a dedicated panel mount USB socket(s) hard wired to vehicles 12 volt supply before or after ignition switch as required. Something like link below.

[Linked Image]

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone