Do you have the room in the 4 Star for the smoke tank to be located on the cg ? I thought that was the servo tray location.
A couple of local pilots tried the small 2 stroke smoke trick and I wasn't impressed. For all the expense and trouble, they would have had the same results be simply running the engine rich for the same smoke trail. I don't know if there is a small 2 stoke muffler offered now that has the coil inside like the ones for the 4 strokes.
You seem to be locked in on this one, so goffer it.