you couldnt minetweak it, but you could do it with something as simple as command blocks even, but a plugin would likely be the better way
Or... Punish those who harass, and leave taglocks alone? We staff are here for a reason. If you have a problem, take screenshots and submit a ticket. Prob solved.
But this requires an addition to the rules. And that is ultimately what I am proposing here. If someone is using taglocks as leverage or to harass other players that should carry its own punishment aside from standard Harassment.