The detailed activity seen in a true hamon will not show on this steel, if it is indeed 1080. You can get waves and transition, you can even get more than one line, but I doubt that you'll be getting anywhere near the activity you get with 1095, W series steels or any other low Mn. simple carbon steel, at least not in the high carbon area that we're talking about.
I don't think it's going to matter what your heat source is or what insulation you put on the blade. I have done many clayed blades in 1080, 1084, 1065 and 15N20, they just don't get the same activity, no matter if you do it in an oven, in a forge or with a torch on the edge.