One sneaky thought: is there a way of doing the UV map so that the rings are mapped in UV space as straight rows? You'd need a disc in the mesh... No, you could manage with an arc of bricks, but it couldn't include the centre of a circle, and distortion would be a problem. The Mesh would need enought points to make each row of bricks independent. To be honest, you might as well draw a bitmap whioh can control a blender node. That lets you combine a brick texture with a mortar texture, doing much the same job as a Brick node. You can get decent textures with fairly simple node combinations. The trouble is that moving mesh points with a morph will distort the texturemap, and shader nodes depend on the UV coordinates, usually. So simple x/y scale changes might be managable, but otherwise?