Wouldn't you just need some kind of app to do it? If the frequency and protocol is correct (hardware is compatible), I would think you just need a way to transmit the data. I assume there are apps for that. It seems to me all you need is an app to "copy" the data from the key and transmit it when requested. However, I have no idea if there is security in preventing the copy, if there is a random code change at each interaction (like a garage door opener), etc.
Try checking the NFC tag reader/writer apps in the play store and see if any of them will read the tag with the phone hardware. That would be the first step I would think.