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NRPN messages consist of at least 3 different CCs (99, 98, and 6) and the QuNExus doesn't allow you to map more than one CC to a single sensor data type at once.
There is a controller layer that you could assign the other two CCs to pressure and tilt, but you wouldn't be able to reliably address the same parameter consistently.
There isn't a way to do this without some third party software.