It is overkill, but whether or not it would be a good idea would depend on what you think of the idea. Would you like it or do you think you would not?
If the panties were wrapped securely around the ball, they wouldn't be pushed anywhere. They would remain wherever the ball gag is. I was thinking though, with the tape over the front, it would be more difficult to make sounds, but I suppose a safer option could be to tape the panties to the ball gag so all three could be used, without the tape being placed over the front of the ball gag.