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Lovely bike indeed. Would it be possible to unwrap the bartape on the front-brake side to move the STI lever inwards (or go the opposite way and just take it out completely) so you have enough hose to push down the NDS fork hose hole/leg so you have enough give to take out the fork? That sounds like the only way to do it if you want to avoid a hose replacement (or shortening) on the front side. You might get away with not disconnecting the hose from the caliper since you'll pull the fork down as you move the STI inwards and have more and more hose length.
Disclaimer: Not a bike mechanic, don't take my advice seriously :) Good luck.
It's my ultracycling bike:
Everything is fully internal - Di2 wires, brake hoses, rear light cable.
However, if I took the stem and bars off, I suppose there might be enough wiggle room to remove the fork. I'll give it a try. Cheers.