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@Dammit
Wheel is in, honking ability present in full.
It turns out that all inner steering column shafts receive a coating from Porsche during construction.
When the upper bearing is pressed onto the shaft its the luck of the draw as to whether enough of this anti-corrosion coating is removed during said process to allow electrical continuity between the inner shaft, bearing and outer part of the column.
In this picture you see my rack with the central shaft removed, and the contact point now lightly sanded to remove factory coating where it meets the inner race of the top bearing, that is located in the outer part of the column. Once re installed Precision found/achieved around 4ohms resistance between the inner and outer part of the column. ( via the top bearing) . The bearing in the lower part of the column is isolated via a large rubber buffer, so no continuity would ever be achieved through that point.
Luck of the draw on how much resistance a rack provides when being built from new. Very little continuity is needed to operate the horn.