Yeah, that's why the second prompt starts with "You misunderstood" and a correction. This is a long conversation, with multiple experiments performed and a lot of inspection of all the intermediate results on my end between prompts. You assuming otherwise without reading is a bit offensive.

To your point on installation: sure, but if you value it that much, just pay Valve to add you to the Steam store? And that would be the only possible solution given my constraints, all explicitly mentioned at least once in the linked conversation:

   - binary produced today works
   - without changes
   - on both Linux and Windows
   - is a GUI app
   - has some dependencies
   - is developed on Linux (no Windows needed)

For this set of constrains, Proton/Wine with a cross-compiled Win32 binary/bundle is literally the only solution (care to name another?)

For other constraints, it's a solution. Worth considering. That's all.