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You will likely have to get the rotor off to be able to replace a spoke, so will need that tool as well (same lockring as the cassette?)
This is a good point I recalled when I realised after posting. On my rim brake wheels with DT Swiss 240s and Velo Orange hub you can pull off the freehub and cassette in a oner to replace spokes.
I usually carry a fibrax emergency spoke on my longer audax rides and hopefully can manage to lace that behind the disc on the NDS, but being able to get the cassette off might make this a touch easier on the DS.
You can do this on Hopes quite easily, although: