Pro Sites and New Blog Templates customization

I have to queries:

1. I need to know if that’s possible to redirect this button “choisir ce site” to “reservez votre site”. So when a user chooses template the page will be automatically scrolled down to the “reservez votre site” button.

2. I need to force users to choose the templete before to create a website, so they shouldn’t be able to create a site without choosing a template.

Is this possible?