I always finish with a different tool, so have never tried to change the G332 on the fly. I could write it into a program to see what happens.....
I guess the safest way to change the R value would be to return to Z0 as if you were doing an M6. Cancel and recall AICC with the new R value, along with cancelling and recalling your tool offset as well of course. With the NH it would probably take less than 2 seconds