Hehehehe... I just did...
Just copy all the contents from the stock one to your computer... then format the new card and copy them over.
(Power off phone first or unmount the card from the settings menu).
I think with Android, popping up a new card is no issue unless you have media and stuff on it.. but then, I just looked at my stock SD and it had for instance, some maps for my country and stuff.. that I guess is important, hence the copy procedure.