BPDaily - How to use same header on subblogs

I want to setup the BP Daily theme as the default subblog when new members sign up.

The feature is great, but I do see that it doesnt inherit the same blog header.

I want to keep the same look as my main site for free members, so have my header branded at the top.

What's the best way to keep the same header on all subblogs with the BP daily theme?

Do I need to create a whole new subblog, or how would I keep my header there?