Revo is now released, which may reduce your anxieties on that score. I’ve hardly looked at it yet - I’m still finding my way around Evo, after all!
Rather than pkBlog, I’d recommend you try
PubKit, which can more easily be extended with other front-end input features, if you want to try this route. I know there’s at least one satisifed customer for PubKit out there!
If you want to keep installations and potential wrong roads to a minimum, you could first explore the route of creating a blog as a manager user in Evo, along with ManagerManager to create an easy environment for blog entry. I don’t think the demo install shows this off very well (it was never very clear back in the days of the NewsPublisher snippet, either).
Working on and with PubKit, one thing I have found frustrating is the difference between manager and web users, as I often want people to have facilities intended for both types in a single session. I believe there is no distinction between types of user in Revo, which may affect your choice.

KP