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What's at all worrying about having the cable ripped to pieces by your rear wheel in the middle of nowhere during a moving emergency charge?
There's already one cable going to the RD, so you could just zip tie the charging cable to that and the seat stay and have the USB end tucked into your frame bag. Looks like it would be long enough, and a sufficient quantity of zip ties would remove any wheel entanglement issues.
Is there no way around that charging on the move issue? Why did they move the charging to the RD?
There's no way I'd be dangling bits off the back of the bike to a moving RD to charge.