Yaw stable airfoil, as I understand it will not recover from yaw but rather will be somewhat immune to it.
It's just airfoil will still produce enough lift for the aircraft to be still controllable. Controllability also depend on many factors besides airfoil alone: size and placement of control surfaces, CG, side geometry of the aircraft and much much more..
When you fly Blanik - it'll let you yaw the hell out of it but when you fly high performance glass ship - yaw can get you in deep trouble in a hurry!
"Dropping" controls will recover Blanik if there is enough altitude and not all glass ships will recover with ease.

As always - speed is the king and if it's not there yaw will get you in trouble earlier.
Once I was told that 2-33 glider will not stall at all - when I showed flight instructor at LISA how easily it is stalled on any speed - she was beyond the surprise after flying for 50 years. The answer is: rudder/elevator bad combination. When there is no rudder - elevator along can do the trick.

Flying wing has one inherited feature that is hard to get rid of - unrecoverable stall. How bad it is - depends on a design. You can control/minimize it in classic design by using leading edge slots, bigger stab whatever but on flying wing there are limitations introduced by design.
Looking forward to see how this project unfolds!
cheers,
Mark