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ADE7878 calibration

We are currently developing a series of energy monitoring units with either CT or Rogowski Coil (RC)current sensing. It is for 3 phase 4 wire grid systems, based on ADE7878. As the units are delivered without matched CT / RC current sensors, we need to calibrate the units current sensing inputs. The CT inputs could be calibrated with a good sinus source. However RC is more difficult. We have read AN-1076
1. Could we calibrate a RC input, using a good voltage sinus source, with the ADE7878 set to CT mode, or do we need a physical calibrated RC.
2. Are there any RC emulators available, like e.g. thermocouple / PT100 calibrators
3. What EMC hardware protection of the current sense input do you recommend.