i am not really familiar with creating different sound clips for games, but would it not be possible to make a generic swampy sound and just make the other sound effects like bubbling bugs buzzing a random occurrance?  this would allow you to cut back on the length of the original clip and also guarantee that you will not hear the same cycle of sounds ever.  I am only 1 year into a game programming degree so i am not too familiar, but it seems possible and if it is, i think this would be the best option.