You may elect to use it at your own peril and fly it out of the box.
Absolutely legal here if it is in the FMS database, as per my pic above. The PM monitors the approach in Rose/Appr display with the NDB needle. FMS Profile monitoring is not relevant as there is none.
In fact, the ADF display in my machine is so bad that the "only" way to do an NDB approach is with the box.