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@gbj_tester
It's a bugger to do. You can only take the 5mm off on the disc side, otherwise you'd have to get involved in shortening the cassette rotor, and nobody needs that. You then have several more problems.
1: You need to move the disc calliper left 5mm, which should be fairly trivial
2: You need space on the non-drive side to clear a disc rotor which has suddenly got 5mm closer to the chainstay than it wants to be
3: You have moved the drive side flange 2.5mm to the left, which might mean you have all but eliminated the spoke bracing angle
4: You have moved the non-drive side flange 2.5mm to the left, making the spoke tension ratio even worse than it already is on a normal hub.