Good one. I'm envious now because I cannot get away myself. For rough ground bivvies I prefer the foam mat, it levels out the bumps more and cannot puncture/deflate.
I presume you brought the sticks with you. An alternative to that, or a walking staff, are some standard thin tent poles, as thery pack away easily. I've just chopped a shiny 6-section one into 2x 3 sections, but need to paint them now, to hide the shine and make them look natural.