There is a Panasonic option called P2 Mobile. It has an editing capablity. All you have to do is select the clip, Open the playlist menu. Go to Setting and make sure you set TC replace then you can set your own TC. Once that done go to menu File Append the selected clip Once the clip is on the timeline as an event. Open Menu go to operation then EDIT COPY to another card and your new clip will have new TC because it generate complete new clip out of your old clip and it will have new TC no computer needed.
Thank you
Rajesh Lad
Panasonic