UV tile selection / manipulation?

I’m trying to make a mask of a tiled image (3x3) and move that to point 0 and Lerp to blend a new image. The mask can be any of the tiles 1-6 but must be repositioned at 0 then keeping the size the remains be left blank for Lerp.

I found a method that works but would like to somehow create the mask instead of using a Texture. I created a Function that will reposition the tile texture and a mask from an Image…


I have eventually found a solution replacing the Image as the mask without using a texture …