wp php code to make all multisite Page Titles refrest to main site title.

Hi.
Could you help me with an MU_Plugin piece of PHP code, please!

In Multi-site, clicking on the 'Site Title' will take you back to the 'Front Page'!
The same is so for Sub-sites (they return to the related Front Page!

Could all of these be made to redirect to the Main Site's, Home Page, please?

Thanking you in advance.

Regards

John