can you use a 2nd uv channel for the normal and tile the 1st channel for the diffuse while having unique uvs in the 2nd for the normal map? or vice versa if it support multiple uv channels.
noise -> 1 px width -> 2nd uv channel(vertical mapped) -> rttd as diffuse to 1st mapping channel, normal map from sculpt as background, -> smearing around the corners to make it imperfect, then crazybump mixer or rtt again makes the deal almost perfect