Depends on the runs. I'm going to assume that they are stubbed up into the ceiling space at the top. I think the main issue is going to be the transition from NM to the tubing with the connector requiremment. I don't believe that you can put an adaptor and NM connector on the end of the tubing because it needs to be accessable. This would mean extending the tubing to an accessable J box. This would also mean that there would be no reason to pull NM but rather single conductors as necessary.
-Hal
