I think that I would be more worried about the dynamic situation. Torque is not applied smoothly by the average rider. Instead it arrives in pulses as the riders power is delivered to the pedals. As you point out in your example, the rim of a radially laced wheel will lag behind the acceleration of of the hub. ( probably by a substantial amount more than that of a wheel with tangential spokes.) In effect this is wrapping up a spring and as power diminishes at the pedals, the spring will in turn accelerate the rim more than the hub as it tries to achieve a ballance point. It would be interesting to chart the sine wave of spoke tension rising and falling with each oscillation. I have a feeling (unsubstantiated by any hard data, just an initial impression based on the small angles involved in the trig functions for radial spokes) that the tensions would be quite high. Leading and trailing spokes may dampen this tendency toward oscillation.

Given the recomendations of the published wheel builders and the even stronger recomendations not to use disk brakes on radial wheels (same torque situation) I for one don't have the courage to put wheels in service that are built that way.

If it turned out to be safe, I would be among the first to climb on the wagon as there are several other advantages to radial spokes that I would like to explore beyond the half radial rear that I currently favor.