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Not sure, possible. They had issues with supply during and post COVID as I was asking them about replacing the front-end on ours for a longer one and gave up! London Green Cycles seem to have stopped supplying them. I think there are a few "electric" bikes shops that stock/sell them now, but these would be electric models only of course, but they can get other models in.
These have a shop in Acton which I visited:
https://urbanebikes.com/collections/douze@Vince has a Douze and whilst he was in France in (his/a) van he's bought some bits for his Douze as I assume they're easier to get hold of and cheaper?
If you want to test ride a non-electric Douze we're in West London...