ok
So, As you have seen, this year, there are differents shape for helmets, which are based on real models (Schuberth, Arai). Alonso (or Massa or Rosberg) have a Schuberth one. And the helmet shape for career driver is a simple helmet, without anything special.
My wish is to put the shape of Alonso's helmet for the career helmet.
Do you understand ?
If you do that, you may well muck up how the bespoke helmet templates apply.
Best way to try this out is to apply a bespoke helmet texture to say Alonsos helmet.
If the texture is applied correctly to the rear fin, then changing the model won't be an issue. If it applies wrong, then there is no point in changing the helmet.
I think you'll find that the textures might well screw up.