Can you not buy a right hand rear brake designed for people who use Euro levers?
It's going on a Bullitt and I'm pretty sure the front run is over 1700mm.
I might have to get one made up. Larry v Harry offer the XT groupset as standard, so there's obviously a solution, somewhere.
SLX https://www.bike-components.de/en/Shimano/SM-BH90-SB-Brake-Hose-for-XTR-M985-XT-SLX-Alfine-Brakes-p28864/
there is a 200cm kit (hopefully long enough)
Goodridge will be your best bet surely. Just find the correct fittings using charts on their site and then order as many meters hose as you need. On a run that long I'd splash out and get braided hosing to keep the brake feel nice.
@Mikenetic started
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Can you not buy a right hand rear brake designed for people who use Euro levers?