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Emyr
Mismatch final cut.
Hone cranks and reworked Raceface BB. E13 36t chainring and Gamut chain device.
Bit of cleaning then go rummaging for fitting hardware.
Bit of a ball ache but the chain device bolts directly to the ISCG tabs* on the BB shell.
You then have to faff about with spacers for chainline and clearing chainstays as the stays move. It's possible to fit a device, have a heavy landing and find the chainstay/swingarm connects to the device at full compression bending or snapping things.
*ISCG
International Standard Chain Guide tabs. Most likely a few more standards now due to Pressfit bearing standards.
Oldschool
BB adaptor plate to ISCG 4 the BB cup holds the plate in place for frames with no tabs. Have one somewhere. Might still be on Monk for future use.
ISCG4 like BCD for cranks this is a ref to diameter of tabs on BB shell.
ISCG5 A larger diameter came in with external cup bearings as the ISCG4 devices won't fit.
Older Bikes tend to be ISCG4 like my 2007 model or use an adaptor plate.