Changing "site-title" for sub-page

Hello
I’m not having much luck finding an answer elsewhere for this.

I’ve been asked by a client to create a page as part of their ‘campaign’, and they want the current site title – Pakistan Health Policy Forum – to be changed to #EndMedicalPoverty for this page only.

Can anyone help me out with a suitable code snippet to add to functions.php to display this unique page title? I’m still very much a beginner with php and can’t quite get my head around calling a specific change to the site-title for a particular page.
I have my reservations from a site usability point of view, but this is their request.

Theme: Genesis framework -> Magazine Pro.

Many thanks to anyone that can help me out.

Alister
http://dev.trail-maker.com/endmedicalpoverty/