Personally I would keep everything at 12v. Can you get a camera charger for that? The 12v charger for mine from Nikon is around £200, the Hahnel one I bought works well, does mains too, is compact and was maybe £40?
If you did take an inverter and then mains chargers I would have thought all of that would be quite bulky?
How good are the expensive solar panels you can get on rucksacks these days? Could you even cover your top box in solar panels, that would be cool
Or
Voltaic Solar Powered Messenger Bag
4 watts won't run your laptop but may recharge it?
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