I haven't seen the Military of Delux models in person yet so I'm just guessing here. But it seems to me the tanks are the same shape. If that's true, then the thicker pads that screw on would be the correct contour to fit a Classic, Electra or 65. No screwqs, no problem. There are plenty of adhesives that would hold those pads on there for ever. Gorilla glue comes to mind. Nasty stuff and won't let go.
Come to think of it, I'd like to have a set of the thicker knee pads on my bike too.