Multisite - create multiple childthemes?

Hi there,

I am creating a turnkey solution where clients can sign-up, choose a theme, and then use Customise to modify the site accordingly.

I wanted to create child themes that the client can select once they have set up the site.

Is there a way to create child themes where I use GeneratePress Customizer settings (rather than add them to a style.css file for example)? That way, the client can modify the settings accordingly in future without needing to change them in the css file.

For example I was thinking of create 10 child themes with a different colour scheme, and perhaps different header/footer styles (e.g. nav bar to the right of logo, nav bar below logo) to give the client a ready made template that they can start using straight away.

Is this possible?