Change normal map bumpiness runtime?

**Can the normal map's bumpiness setting be changed at runtime from scripting or shader or both?

I'am trying to get a bubbling skin affect and it seems that particles are too slow. I'll have this affect on 5 or 6 models in camera at once.


The bumpiness slider when importing a grayscale texture and turning it into an actual normal map is a calculation that results in different textures being generated with different bumpiness values. In other words, no. (At least not without changing the texture itself.)