Ravenloft has a beautiful wilderness, that is mostly unexplored, and those who do explore it, usually just do it once to read all the notes. While the guides are a life-saver, they basically destroyed the wilderness and taking them away or adapting them might be answered with some contempt and outcries.
So why not add some quests that uses pieces of the wilderness and either enhance the story-line or are standalones. Like a quest to protect Ireena traveling from Barovia to Vallaki? How about a quest that uses Lake Zarovich? Whenever I see all the art-assets basically wasted on a wilderness that has little reason to be explored, I kinda feel sad.
I know, most of the interesting places are made into quests, but you have some creative minds and maybe can add some optional pre-quests with ambushes from Strahd and his forces on the Tsolenka Pass, looking for a cure for lycanthropy at the River Ivlis, defeating mountainfolk raiders that are in the northern svalich forests, etc.
I don't know how much of the IP of the 5e-module you can use, but there are still crazy dollmakers, the mad mage, and other nice things there as well.