Thank you Marc and Leo. Yes, I had scanned through the SMuFL symbols too. The oriscus looks similar. I just wonder, where this “Haydn ornament” symbol derives from. I have not read anything about it so far. Daniel somewhere acquired it and put it into the SMuFL font.
If I look at a Breitkopf orchestra print, they just use a short trill symbol: 
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In the SMuFL set I found the Wiggly Trill lines, of which I could use one for this project: