How to duplicate way in the same nodes in JOSM?

I am separating boundaries from rivers, because they share the same map feature, the same way. What I want is to duplicate the way, by using the same nodes, in order to have the old way for the river properties, and the new way for the boundary properties.

I don’t know how to do that in JOSM. There is a duplicate option (Ctrl+d) but it creates a new way feature with new nodes, so I have to merge the nodes, or move the new way very close to the source feature, and this create crossing issues.

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/how-to-duplicate-way-in-the-same-nodes-in-josm/3067