While I too await with anticipation for the new ArchiCAD 28 plugin for Twinmotion, I have found that saving the 3D view in ArchiCAD 28 to a SketchUP (skp) file works just as well. Way less painful than having to save back to ArchiCAD 27 or not move to ArchiCAD 28. Any changes to the model just save to the same skp file and then refresh the model in Twinmotion to update the geometry. Has worked well for me on some pretty big models, and has let me use the new features in ArchiCAD 28.