Wireframes are very educational, but at the same time they can be very disorienting. Would it be possible to have wireframe enabled while textures are still enabled? For contrast the color of the wireframe could continuously cycle through the entire color wheel to ensure at least some of time it contrasts with the surrounding texture.
Alternatively the terrain could be plain colored instead of textured with constant colored contrasting wireframes. Perhaps the plain color could be the color average of the texture, assuming that’s easy to obtain.
It may not work perfectly (such as some dashed lines) https://www.opengl.org/discussion_boards/showthread.php/127465-Dash-line-in-wireframe-after-fill-polygon
However I think it would still be a great aid in making sense of the wireframe meshes which don’t hide meshes that are behind other meshes resulting in a jumbled mess from many vantage points. In the hybrid model the wireframe would be the first pass, then filled polygons on the second pass covering wireframes that are behind them.