If that was possible, people could make all sorts of maps with entirely different quest lines and have them all loaded on the same instance without issue. People could make a map using HQM on, say monster and have their players only install the mod and the map is good to go without any fuss. I could have my own sugar-themed quests, and rewrite a bunch of recipes for new quests and provide a whole new experience, and all my players would have to do is install a map. Nothing new or complicated. Easy. HQM would use the quest files contained in the save folder instead of in the config folder. If there are no quests in the save folder it uses the quests in config.
I would honestly love to make my own quests, but doing so would be horribly messy. Sorry all.