Displaying Custom Page Properties with Navigation core component

Hi everyone.

I am using the navigation core component given by adobe to create my header and I have implemented it into my header component without making any changes. Now, I have added custom page properties and I want to display them using my navigation component. I cannot use the current page's page properties since I want to display all the level 0's page properties. 

I've tried extending the core navigation model but there's a lot of different models I will need to change. Is there any other way to achieve this or is extending the core model the only way?

Thank you!