I’d set up percussion staves and then change the names. You can do that in Setup mode. Click on the little arrow by the side of each Player; then click on the arrow by the side of each instrument name that is revealed. There’s an option “Edit Name”.
Yup, that’s it. Although technically you don’t “import” i.e., use the import function. You just open the XML file.
Dorico has a lot of power under the hood that can be accessed with a few XML tricks. It’s future looks bright indeed.