4.) point your brandnew domain to those namservers
5.) chose an existing domain and link from this domain to your brandnew domain like
http://www.brandnedomain.com/keyword.html
I suppose you could put like
1. NS1.YAHOO.COM
2. NS2.YAHOO.COM
3. NS3.your-real-nameserver.com
And when it fails to resolve at the other two, it will go to your backup. But like someone said, it would be pretty dumb of google to give any sort of credit for what nameservers your using.