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@Dammit
I spoke to one of the technical people at Madison, the answer is that you can run the internal battery with the EW67 handlebar harness, however you will need to remove the battery each time you wish to charge it.
This is no great drama- the battery lasts for 2,000 Km, and I do it with my road bike.
However- one of the advantages of the BCR2 charger is that you can use it to update the firmware and gain multi-shift, set shift speed and so on.
But you can't do that without the new junction box, as it cannot plug into the harness without it, apparently.
So- if you want to take advantage of all of the firmware upgrades and so on you have pretty much no choice.
I'll (shortly) be able to upgrade Di2 firmware if anyone has it and wants the latest version, btw.