sylvain: The GTX should be Vulkan compatible. Maybe send us the tm.log file right after you tried enabling Vulkan.
For developers we also have the developer camera enabled without hacks in the main.mcf. Press CONTROL+F8 to enable this camera. Hold left mouse button and move mouse to look around. Use 'W' and 'S' keys to move around. Press 'R' to go close to the airplane again.
Here is what I see in the tm.log file