I am using WPML + WCML and have several languages on my page, managing shops in different countries.
What I want to achieve is that a shop manager in a specific country (with a custom role "shop manager Germany") will only see the orders with the custom order meta 'wpml_language = "de"' in the admin order list in backend.
I already tried to solve it with the toolset access plugin, but there I can only select posts, pages, and products, not orders.
Please note that we currently are not able to provide support for custom work within this forum. I will, however, try to point you to the correct direction.
For any custom work we suggest contacting one of our 3rd party contractors that specialize in custom work with WPML https://wpml.org/contractors/