Hi Martin,
One of the solutions I learnt from my colleague is to write a python script to insert cohesive element in Abaqus (but I didn't try it, and there may be some available scripts online). For ANSYS, if the model is not very large, you can manually renumber the nodes. For a large model with loads of elements and nodes, it would not be possible to deal with node numbering manually, but you can try to export the model and work on it using matlab or other programming language.
Hope it helps,
Feiyu
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