Changing bonus objective in Canyon Cleaning?

Could it be feasible to change the bonus objective in Canyon Cleaning? Since, when playing the Celts, it becomes completely impossible complete, unless you use those consumables that costs EP. You could argue, that simply just don't play that quest with the Celts. But perhaps it would make it to easy to complete. I must admit (and thats not easy for me, seeing I'm perfect ), I have rage quit af couple of time on those occasions, almost causing heart attacks

 

That's okay, you could also argue, if anything should be changed constantly, just because someone (like me;-) don't bother to try enugh different strategies, the game would/could become a bit messy. So I'll just make it my purpose in life to complete it with the bonus objective, and some different strategies. Because the game really does inspire strategig thinking. So i think you are right.