If I was GM ? I'd fire Julien and hire someone with a plan to develop KK.
If I saw the future and I saw that KK lost both his legs in a freak accident and that he held no hockey value after that moment ? I'd trade him for Seguin, Dallas is a team that won't go anywhere with him and Im sure they could be convinced into a rebuild if they lay they hands on KK.
But it doesn't mean turning Galchenyuk into a C, it means getting the most value out of him, wether thats a center, D, winger or picks doesn't matter.
As of today, I don't think Bergevin got full value for a single one of his trade. Not on Subban, not on Sergachev, not on Galchenyuk. The only trades he got full or more value on were smaller ones that turned out to be miraculous like Fleischmann and the 2nd rounder to EDM.