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Happy to discuss selling the other flat mount brake if you're interested.
Definitely the place to start.I got the synapse alloy mechanical disc
Cable guide. Not sure it will be what I need as it looks like that frame is designed with brake cable stops and no internal housing. So might go for the zip tie method for the full compressionless as mentioned in that link I shared earlier.
You wouldnt be the first forumenger to build a bike just because of some brakes...