Smooth blending of different material instances

Right now the only way to blend multiple materials smoothly is to bring all the textures into one material and use mix-color or mix-shader to blend between them

if i pass the same image in geometry nodes the selection is face based so the transition is blocky

Its time consuming to change a material later on, messes with the flow of asset manager's quick drag drop functionality,

It would be nice to have a setup where Image or color attributes can be used to smoothly blend between different material instances