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@Ptown
Thanks @mdcc_tester, @Scilly.Suffolk and @svendhöek! Trialled it today with a 103mm JIS BB (lot more research and I'm fairly sure they're designed for 'Low profile JIS' which isn't gonna happen unless I cough up for a Phil Wood) which gave me ~130mm Q-factor and around 1mm clearance on chainstays. Job done.
edit: didn't measure chainline but it looked straight with cheap commuter flip-flop wheel in the back.