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I doubt many people would have done it.
I have abet with a carbon CX fork, didn't regret it.
Those bosses on the Mash Works were very common in mountain bicycles back in the late 90s/early 00s when disc brakes starting to pick up, as the frame come with both disc and canti tabs.
The biggest concern is whether it'll work with the stay/fork design, thin aero profile fork might be hard to work on.
Not a huge fan of the pompino fork so I'd probably end up buying a new one and I'd like to keep cost to a minimum, being as I have a fair bit to sell think I can cover the cost of a new wheelset for cx mode and all the Brazing I'll need to get done. I'm a huge fan of the mash works frame but don't have the space for a cx bike and the idea of turning the Brooklyn into a versatile bike seems legit to me as I doubt many people would have done it, so I'm on the hunt for some removable cantilever studs so I can weld the bosses on the frame and keep them to mount the brakes and then easily remove them if I strip it back to fixed mode.