Hey Werner,
So you want to bend a model, then blend in the bent model based on color? I did exactly that and it looks okay. I added some color with a nice falloff. did a bend, did an attribute transfer between the bent version and the original version, then did an attribute wrangle with:
@P = fit01(@Cd.r,@P,point(1,"P",@ptnum));
Then bent parts now have a nice falloff because the color controlling it has a nice falloff.