Stick the rear brake under/behind the BB and route the cable through the downtube and the routing issue is resolved, also.
Horrible brake pad rub though if you're giving in the beans. I'll stick to the usual rear brake position for now. Unless I too decide to use waffer-thin seatstays.
@Brommers started
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Stick the rear brake under/behind the BB and route the cable through the downtube and the routing issue is resolved, also.