Just want to pitch in here, I had the same idea as OP, to run Jade Regent with an all goblin party. Here's why: WE BE GOBLINS IS LISTED AS A STRAIGHT PREQUEL TO JADE REGENT!!!
I ran my group through We Be Goblins and they loved it. When I told them it was the Prequel to Jade Regent, they immediately demanded that I buy it and let them run it with their We Be Goblins goblins.
Come on, guys! There has to be a way to make this work!