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Excellent work and a rather neat solution. I may be paranoid but I'd stress slightly about the epoxy giving way during extreme braking. I was thinking about this and one way to negate the need for epoxy would be to tap the fork and insert a thread "seat" onto which you locate your handlebar piece followed by a thin threaded lockring, thus mechanically fixing the the handlebar piece. Then locating the crank arm bolt top cap. I'm note sure what your fork is made of though and if it would be wise to tap the bore of even a steal steering column.
sorted out routing the front brake hose through the fork steerer. Now with a connection point.
It is a piece of handlebar with m20 thread cut on the inside that is epoxy glued into the steerer tube.
and then a m20 crank arm bolt is used as a top cap. The hole in the middle is a perfect fit for a brake hose fitting.
It would be a really neat solution if the crank arm bolt was slightly larger as now it needs another topcap with a big hole cut in it underneath to work (the greenish bit in the first photo)