Still not convinced about bliki as a word, partly a) because it sounds odd, b) it constrains you already to think of just blog and wiki features.
Still, will do for now as a start.
2 What I'm currently doing
For the garden bit, I'm using org-roam. I actually write my stream bits first in org-roam, publish it to HTML, then just manually copy that HTML to WordPress and publish there for all the public stream stuff. As it's IndieWeb-enabled, WP gets me feeds for people to follow, and all the interactions you'd expect from streams - replies, likes, etc.
So it is manual until it hurts, but it doesn't hurt too much at present. In fact, writing and hyperlinking with org-roam then copying it over is a lot more pleasant than writing straight in to WordPress.
But obviously there's quite a lot of redundancy there.
3 Where I could go with it
I could use WordPress pages as my interlinked garden. This would have the great benefit of having all the stream functionality OOTB. I haven't explored WP for wiki pages much, but I know that Ton does it. I think I personally won't do it this way as I find WordPress too much friction for me for writing, but having everything in one system is obviously a big boon.
But I think it'll be a while before I'm set up with Arcology, and even then, given it is static, it's missing a lot of the building blocks of the IndieWeb. So I'll keep it as this manual Rube Goldberg device for now.
But, good to have a long-term goal…