Well...
Full radials are generally frowned upon for any torque carrying hub.
But there's any number of half radial rears.
Which seems to be doing well enough not to cause any undue excitement.


Since you pedal more often than you brake, (and the bigger tension imbalance) fatigue is more likly to strike a rear than a front.


OTOH, braking hard enough to cause rear wheel lift is fairly easy to do.
While popping a wheelie accidentally while being in a regular riding position is quite rare.


So it seems reasonable that hard braking would create more torque than hard pedalling.


OTOH, a sudden "clean" overload while JRA is a very rare cause-of-death for a wheel.
Immediate write-offs are just about always caused by something more unusual. Potholes, crashes, something caught in the spokes, wheel ending up sideways....
So 'd expect you have some strength margin anyhow.
The non-disc side runs, what - 65% or so of the disc side spoke tension. So I wouldn't worry that much immediately about the life of the flange.
I'd expect it to survive with not much of either benefit or drawback. Maybe a little more hub wind-up on hard braking.