[Jawelin]

First of all, thank you so so much for your time and your extensive explanation.
First step, this is exactly I would do: create a new style with only new colors and buttons.

So, I asked myself how to make the new style see the 'default' templates (as said, by now I wouldn't manage parallel templateset and replicate modifications each time...).

Ok for replacements to make color differences. But what about buttons ? I think I should modify templates, is it true ?
Thnx