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You'd need some sort of inverter or USB charging pack - dynamos are AC out, di2 are DC in.
But you're right, it is possible. I was being facetious about the battery - my point was rather more it's still a bit of a silly choice for touring / packing. Battery life / charging aside, if anything goes wrong with any part of the charging / di2 system out in the (a) field, life might get very difficult quite quickly and I would rather a relatively simple and ubiquitous mechanical system to fix.
Admittedly looks like a Transco/enduro sort of rig so horses for strange courses
Edit; uses an igaro for charging.
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Something like this: http://www.bumm.de/de/produkte/stromversorgung.html
But I think it's a really smart choice going di2 for bike packing. Di2 requires a lot less effort to shift, needs far less adjustment of your gears and you can easily do 3000km on a charge. In the 2 years I've used di2 I have never had any malfunction..
And if you're going to go further than 3000km without a charger, than you can easily carry an extra battery or two.. They're only 56gram!
Jaap
If he hooks up the dynamo to the Di2 batteries, there is no need for spare batteries, right?