How do you go forward if you are backpressuring all the time? And by all the time do you mean all the time, even when you are not on the bike that you ride frequently? Or all the time but only when you are on the bike that bike?

How much do you weigh? I suppose that matters. If you put high enough torque installing the cog, then maybe you cannot unthread it by backpressuring all the time.

You really think that a dropped chain cannot get up in a loose cog which is flopping around the axle. You think that cannot happen? And on that point - you think that event is the most basic mechanics of a fixed gear drivetrain? Well, damn; there is not much I can do with this.