In order to actually jam them together, one would have to tighten down the cog, tighten down the ring, and then put counterclockwise force on the cog and clockwise force on the ring. You sure you want to put any loosening force on that cog?

In any case, I think the "jamming" you are talking about is really not all that relevant in this high-torque application. The forces involved in a headset, and even in loose-ball axles are not like what we have here. And notice how poorly those hold there.

I think that tightening down the cog as tightly against the hub shoulder is the best bet. then maybe throw on the BB ring for good measure if you feel like it.

jim