"Tunk Opener in Key" thing is not available from Atlas Honda. That key is Honda OEM and available in other regions. Dont know if it will work with our local Civic. It depends if receiver that comes pre installed in all local Civic including VTi understand the third signal and the ECU has required programming of sending command to trunk actuator on receiving third signal from this key transmitter
Theoratically its possible; but someone who either has done it, exepereinced it or have knowledge about it can confirm better.