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Exposure Revo
If this is designed to be dynamo powered it'll take AC current, which @T4NY4 won't get from the B&M USB charger.
I dunno if lights that can be charged and illuminated simultaneously exist, but even if they do, I'd bin the idea and get cheap proper dynamo lights. Just having dynamo lights doesn't mean you have to get rid of the ones you can move between bikes.
yoshy
The Exposure Revo is designed to be dynamo powered. If it can be plugged to a small battery pack as well then it could fit your bill?
Another option could be any light powered by a battery pack that is also charged by USB, and have two packs.