Save textures/materials as a separate entity?

This might sound strange…I have lidar scanneb an object with an iPhone. This gave me a lot of stupid textures, but they are quite useful for showing where flatter objects (windows or fittings) are on the original.
As I am flattening and smoothing things in Artisan, I have to paint over the original texture as changing the triangles in any way disrupts them totally. But I want to have this material back when I am drawing the small fittings only visible on the texture. As you can see on the screenshot, I have already painted the lower part grey and smoothed it, but if I paint the blue area I’ll loose the window, the position of the numbers and more.
So is there a way to preserve this information like a layer or an overlay or an object?