It is never a cheap endeavor swapping a different type of transmission into a late model vehicle. As you indicated, you'll need various wiring harness pieces, linkage, and fussing with the computer(s). Not cheap to find these, and that's here in the States. And since you'll have to support yourself if you do this conversion, you won't have many places to go to get help fixing or tweaking things along the way.
You would be better off selling the Vue you have now and finding a different make/model that has your desired features or perhaps a manual transmission VUE. Less headaches by not having to do the work involved, no doubt.