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Not a bad idea but what you can't fully appreciate is that there's only about 2' of wall above the neighbors gardens where they've been built up over the years, probably with building detritus. Anyway your comment has prompted me to pursue the cranked metal post option a bit further so as to allay my fears of the first gust ripping the fence down and taking the top of the wall with it. It'll hopefully make the other side look like less of a weird bodge too.
Kinda of grafted over the top of the wall? It is a bit of a concern tbh: A) how susceptible to wind/human damage the finished structure will be, and B) whether drilling in to the capping stone will shake them loose again. Not sure I've come up with an adequate solution just yet. I could just set the fence above inside the wall but it would make the garden feel smaller and I wouldn't be able to fully appreciate the fruits of my labour. The other side has some cranked custom made metal posts. I could get something similar made maybe.