Assign a model automatically

Hello,

I’ve created a specific model for my customer.

I would like to assign this model automatically each time a page is create.
Then my customer will be able to complete the page.

Exactly like i click on model icon then i import it manually.

I’ve tried to use header and footer section but then can’t be edit page by page.

So do you think it’s possible please ? and how ? ??
(i’ve elementor pro too)

thank all