I sympathise with you as a DM, I have been there before for MANY years. I have a decent group now thankfully that dont destroy my adventures!

But one thing I can say, the group of friends of mine that roleplayed similar to yours, well they left the most memorable DnD moments for me.
I also didnt really have to plan much with them - they were so chaotic and just plain wrong that half the session was spent dealing with the problems they created within the adventure (getting chased by the law, releasing monsters, causing mayhem at merchant stalls, putting their friends in danger...etc)
But please, please post an update. I miss those days, sometimes and your playtest was a hoot!