In setup mode, Player’s card menu>Edit Percussion playing technique. Note that you can create multiple playing techniques for your percussion instrument, and you can choose whether they have to be on the line, above or under the line. So I guess this is absolutely feasible.
… and now, in Dorico 4.3, you can change how far above/below the line those notes appear, as in your example they’re a bit further than simply sitting above/below.
Here’s a little example I prepared recently for the SIRD Symposium in Portsmouth (where I gave a presentation about SMuFL), which uses these Swiss rudiments.
Arabi.dorico (452.1 KB)
Feel free to export the library from this project and then import the notehead styles into your own project.
Perfect, thank you guys!