Try doing it this way:
This is the "ring buckle" method that everyone is referring to. There are many ways of suspending the hammock. The two most popular methods around here are probably the ring buckle method and cinch buckles, so you are on the right track.
Are you saying there is a channel on the end which you can undo to make the hammock a ground setup? If so, you can still use the ring/buckle setup by taking apart your current setup, and replacing it with the rings. Just take a rope, bend it in half to form a larkshead around the rings. Then, tie a stopper knot at the end of the two ropes and thread it through the channel. Lastly, pull the rings in between the two ropes, and pull everything tight. This will cinch up the end as it was before, but leave two rings you can use like described above.
I have never seen your hammock, so I am not sure this will work. Maybe someone with a Jungle hammmcok will chime in who can visualize what I am describing here, and tell you if it will work. Good luck!