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@gbj_tester
Don't do it. The rational limit of spoke crossing is when the spokes are tangential to the hub flange; you can't make the wheel torsionally stiffer by going further than that. As the flange pcd increases or ERD decreases, the spokes become more tangential without increasing the crossing. So, 24h 3x might just work on old fashioned wheels with very low depth 27" rims and tiny flanges. With 50mm rims and presumably large flange hub, there is no need to try to add crossings, as the spokes will not only already be close to tangential, but they will be tangential to an already large diameter. It's the orthogonal distance from the hub axis to spoke axis which determines the change in spoke tension caused by driving torque, and you already have enough of the former to keep the latter well within acceptable bounds. Adding more crossing than you need both makes the spokes longer and narrows the bracing angle, leading to a reduction in axial stiffness on both counts.