If the car is asking for an EKA code there's no diagnostics that'll be able to read the becm. The becm is in an alarmed state.
If the Becm has alarmed itself for whatever reason, the chances are that if the car is not responding to the known working EKA code, then either, the door lock mechanism is shot, or the data inside the becm that stores the EKA would of corrupted. It usually converts itself to hex code.
Regarding the nanocom, Colin from Blackbox Box did say he was going to send me one to play with as it's quite an impressive little tool, but i'm still quite sure the software & abilities of the nanocom will not overcome this keycode lockout. I will find out for sure by emailing the guy who designed it.