Ward + Bloodlines Package is an acceptable combination.
You begin as a Ward, without any family ties, or any of the benefits that come from having a family, however you do so with a custom surname.
When you marry and have children, your spouse and/or children will be able to take on your surname as usual.
Remember, the Bloodline+ packages only apply during Exposition and before. So the only people who have the ability to create custom surnames are the early backers. Given that, there's no reason for us to prevent Bloodline+ Wards from leveraging their custom surnames, as they're effectively choosing to start a new family line, rather than assume an existing one. This is acceptable to us.