you can't do that. once the cgear is turned on, they'll all be invalid for now because they morph(? not the right word)
since you're turning it on in-game(which i think is the easier way to go), what you want to do is soft reset att he given time/date and then once you get into the game hit the cgear power button. the seed won't change until you hit "yes" on that next menu, so time the delay for hitting that button.