Can be done... however, the rudder control would always be marginal.

The problem cones from the rudder being close to CG... very small moment arm on the rudder's force applied means... it takes a heck of a rudder to get the thing to turn.

Spoilerons work better for yaw on a flying wing. You just lift the spoiler on the wintip of the wing you want to slow down... the plane can pivot around the wingtip. (the spoiler also drops the wing a bit and gives the bank desired)

Now... the problem becomes one of... making the linkages.