The CAE way of building the Corse gear linkage was to weld a 1/2" unf bolt on to the gear selector arm you have shown.
Welding this on at an angle which points down towards the central tunnel improves the angle of the middle shaft and also much improves the angle that the upper UJ operates at.
I haven't seen one fitted like yours was before but there looks to be a lot of upward motion on the centre shaft which will have contributed to the failure you have seen.
The UJ is also positioned quite a long way from the Alfa shaft which is adding a bending moment to the bolted part as well.
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