Pro Sites - set a "default" level for checkout process

I am using Pro Sites but the site I'm using it on will only have one "level". Currently when a user signs up and is taken to the Pro Sites page they have to select which level they want. When you only have one level it's not very intuitive that you have to click the little button thing before clicking the payment/checkout button. Is there any way to set a certain level to be pre-selected as the default level so users don't have to click anything except the payment button?