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]](https://i.ebayimg.com/images/g/wY8AAOSw-CBhgOvP/s-l1600.jpg)
I have something similar fitted under the dash.
Apple products are not allowed in my cars so all I can say is that it works well everything else
