Home page - two options / splitting site content

Site URL: https://www.themathsmum.co.uk/

At the moment everything I do is under the bracket of The Maths Mum® but I need the "Maths for Life" section to be standalone.  I have purchased both domains but I want to avoid having two completely different websites as there is lots of common pages.  Any suggestions on how I could design a homepage that only has two images/logos to chose what site to enter without the navigation bar?  And is it possible to have two different navigation bars on the same website?  Thanks!

To hide Header on Onepage, add this to Page Header

<style>
  header.Header {
    display: none !important;
}
  .Mobile.loaded {
    display: none;
}
</style>

To hide 2 navigation bars, you can use Primary & Secondary Navigation