Could a tail rotor serve as a spin breaker for winged aircraft?
At least one of two possible devices is regularly added before spin testing:


Jettisonable mass, for example by fixing a sandbag to the tail, or
a spin chute.


Spin chutes do what you propose in yaw, but what they mostly do is to pull the tail up so the angle of attack over the whole wing is reduced. This is equally achieved by jettisoning that extra mass at the tail: Now the more forward center of gravity will add a nose-down moment.

In both cases the lowered angle of attack restores roll damping on the wing. This is really what stops a spin, yaw is less of a problem here.