Replying to Banshee bungee substitute

Has anybody used anything that might replicate a banshee bungee for urban spots? Me and some homies are trying to slay a rail but the in ramp doesn't get you enough speed and we cant find anybody with a bungee so I was wondering if anybody on here might have used a substitute or know of anything that might suffice. At this point i'm almost ready to just throw some bungee cords together but i'd like to avoid the possibility of dying from snap back or some shit. Thoughts please!