Yeah, I tried hunt-the-ding to no avail. I can't find any fancy brackets at all so I decided that, since we're all creative types, we can make our own!!! Here's an example, made using your basic bracket and the calligraphic line tool in Inkscape...
I haven't tried cutting them yet, a couple of the lines are probably a bit thin but you could change these by moving nodes no doubt. It's a general idea!
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