Well it sounds as though you are quite limited for tools. Perhaps you could use a tree, place it in the base of a large branch and muscle it till it bends. Or like sombody just suggested use your car / truck, back in the day, Iv'e jambed even steel stock through my bumper and frame and bend it over, around etc. I suppose you dont have a torch? you could slightly heat it and bend it, alum heats very quickly & easily.

I wish you Luck!