You know, surprising even myself, it seems to have worked...
From the mess in the last picture, I kneaded it again and left it to rise again (because I only have a very vague grasp of the basics of breadmaking) and it looked like this, which looked almost bread like:
Then I put it in the oven at 170ish degrees and left it til I could smell it (about 15 mins), and it came out looking like this:
Sliced, it looks like:
It's never going to win bread of the year - it's very dry and tastes a lot like you'd expect chickpea bread to taste like. But it's certainly edible, albeit mostly as an accompaniment to savory things. It's definitely got a chickpea taste to it. I don't think you can make chickpea sweets, though I suppose you might be able to make a baklava type thing. Maybe I'll give that a shot next... This bread might go fairly well with honey, now I think of it.
Anyway, I'm calling this a success. It's certainly better than nothing!