It can not be done, I work for a honda dealership and we have done this many of times. If you have no key what you have to do is buy the whole immobilizer system and it comes with the red (overwrite) key. Then you have to use the Honda PGM tester to reset the system and rewrite the code to a new code. Then you have to cut a new key HOP#(35113-S84-A01) or a (35113-S84-T5 are cheaper) by vin and program that key. If I was you guys I would make 3 keys just incase.Fyi