Thank you for sharing pics, Les. What amperage your AC to USB charger provides? I've found that almost for the same size plug you can find a 1A output rated chargers. Some smartphones will take that easily making recharging from AC almost twice as fast.

Also I would recommend a car inverter for your kit. I know, your devices will take the 12v car output natively, but the inverter will close the last gap in the "power loop". I have found plenty of compact inverters on eBay and going to test this one (almost pocketable) on my trip to Australia (additional benefit - it will power my 120V only devices easily, as in Australia they have 220V grid).