If you use the center plane as the neutral plane (draft hinge) and split at the neutral plane, that will work. However, the draft will not originate at the edge of the cross bar feature. Each side will look more like the 30 degree side.
You can try using the two edges of the cross bar as your draft hinge and the center plane as your draft direction, but I believe the hinge has to be a chain. It may work if you build a chain to connect the two edges, perhaps under the overhanging portion.
You may have to build two draft features, splitting the first by the draft hinge (edge of the bar) and only drafting the one side. Then draft the other side using the other edge as the hinge.
In this case with two draft angles and the (assumed) requirement to pivot at those edges, it may be best simply to create an extruded cut. That will give you more flexibility with it down the road.
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