1x GRX 12speed Di2 Experiments

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When Shimano finally released the Di2 12speed GRX, a proper 1x variant was missing. That doesn't mean we can make our own solutions. This time I wanted 1x with either 42 or 44 in the front with Shimano's XT 10-45 in the back, almost a 10 tooth "out of spec" cassette. But it does kind of work! Mentio…