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@Glws
maybe i'm stupid but in my mind chainline is from wheel centre ? so a 107/109 bb should give you a regular chainline on a 120 wheel, no matter dropout width.
I read that the chainring catches the chainstay so why not a centaur 111mm? or going further a UN 113 ?
https://www.ebay.co.uk/itm/404985706410