Re: P2 Theme
In short…we define a page template which we redirect to from the group blog. Since the child theme resembles the group exactly, it won’t matter. So it will be like your posting from the Group structure. Since our child theme page template loads its own css file, you can still style the main P2 blog theme the way you want.
We don’t want you to work hard, so we are prepackaging a P2 child theme that works out of the box and looks like bp-default. With some more effort you can create your own child them too, but not everybody can theme.
So, yes, I would wait if you can and see if we can meet your needs. If not, you can always continue your journey, but it is up to you 
