You can always try: Export (from AutoCAD) to ifc. But you still need to be set up properly in autocad (coordinates, elevations,etc) for it to work smoothly. And, you’d be “designing on an island” so to speak so you’d have to judge the pitfalls yourselves. I’d go all out in Revit, to save myself the problems you WILL encounter going the AutoCAD-ifc route but that’s up to you.