Adventure Creator for Unity, and those kinds of things, are toolkits. As such, they usually involve both run-time and editor scripts. Run-time scripts can be found in C2, but editor scripts, a crucial part of any toolkit, are not available in C2. So what you'll find, if you find anything at all, are C2 templates to give you a framework for creating things. In your case, you might want to look for adventure game templates. However, because they're not toolkits, and unless they're quite elaborate, you might come upon a dead-end, where the template doesn't do everything you'd hope it would. You would need to add things of your own.
If C3 had an editor SDK, it could potentially open the door to a lot of different things, including tools such as Adventure Creator, among other things.
You could potentially ask someone to develop something bespoke for you: there is a classified section in the forums.
I'm creating an adventure game, too, but in isometric style. I started doing this game in standard adventure game format but for many reasons I moved into isometric viewpoint. The beauty about doing things in C2 is the fact that despite its advertised ease, programmatic control can be quite granular. That's why I like it; it's a good balance between ease and control, but it won't give you an adventure game framework.. not by a long shot: you'd have to make it yourself.