Well, a sub-network would probably work for the journaling idea I had. I’ve used Capsule for years, and it does dev notes really well (though not mobile friendly), but I prefer to take journal notes using something like P2. I would use something like that as a network.
Then there is the theme based on reveal.js. You can read about it, some think it should be a plugin, but I like the idea of using WordPress as the framework for it (and Capsule is also a theme, loaded up with functionality.
That all said, and despite the encouragement from you peeps, I just don’t have it in me to set this up. I am still interested in some kind of journaling system that is easy to use and not dependent on a third-party, but running multisite networks is something I’m over. It just doesn’t hold the same technical weight it did in the past. And a lot of these packages are not actively supported, even to just bump up the compatibility numbers, so it would be a losing battle.
If I run a multisite instance, it will be for free hosting for very specific types of sites that follow guidelines I set out, specifically non-creepy blogs (meaning ones that don’t track folks or serve them ads). And that has been on the back burner for a while. 