Problem with ProSites expired accounts

I have ProSites with pay to blog. We offer a 30 day free trial but do not have a free level site. When sites expire I am having 2 problems
1. Subscribers have no way to log into their account to pay for service
In ProSites settings, there is an option to disable Front End (which disables front end and back. Is there some way to disable front but NOT the back so that they can login and pay their account?

2. Expiration Email notification is not being sent out! I've developed a mailchimp autoresponder but then there is no merge tag to access their site. I cannot find what the URL to upgrade even is! I'm using the plugin "Checkout Rows" if that makes a difference. I have rebranded ProSites to Using Essential Oils

As you can imagine, this is a real problem. I've also requested a feature for adding the paypal account info at time of signup to provide continuity of websites.