The thing is that bullet 1 has to do with Views, not with Themes, so if I change the theme at the Platform selection level, it will change it as well inside each platform, keeping the view on each one yes, but with the new theme, not maintaining the one I had before.
Bullet 2 is what I did before when trying to test different themes in the Category/Platform level, so I changed it there, and then accessed each platform and switched the theme to the one I wanted. The problem with this is when you have over 30+ platforms, I cannot afford to change a theme on the Categories level, and then access each Platform one by one and switch the theme to the one it was before.
Makes sense?