Hi, I have a door with a cipher lock that I would like to add a card reader and strike to. The card reader and strike works independent from the cipher lock and don't interfere with one another to open the door. So you can enter by keying in the pin code to unlock cipher lock or use card access badge to energize the strike allowing door to open. From inside, it only requires turning of door handle to exit. Would it be illegal to have both cipher lock and card reader / strike each not interfering with the other unlocking door and why?