There is no any recommended way, except if your project is still new and
blog is an essential part of it, you could just base on byteflow and evolve it
the way you need.
Another possibility (as Daniel already mentioned) is cherry-picking desired
functionality from byteflow to your project, although this will take more time.
And third possibility I see is just using this two projects together,
any webserver
(apache, nginx, lighttpd) allows you to bind them to different urls
(or subdomains).
There is no need to think about single sign on, while you're using Django's
sessions, but you need to be aware that Byteflow creates a user for every
commenter - you may want to change that (or not) depending on your needs.
Good luck! ;-) Ask more questions if you have them.
--
Alexander