It is quite good to customize the current theme than creating new one. Will be update safe. So i believe from the 5 themes from the list, i am sure you may not need 1 of them. So what you can do is Copy that theme to WordPress theme from the link and customize it as per your need. You can use same name and folder, just edit as needed.
I can even send you video documentation to add new theme. But it will need re-setup when we have new plugin update.