I can feel you but have you ever just done /staff and called a staff member onto the server to help you, everytime I'm one there are atleast 2-3 other staff online.
Again if no staff are online you could ping them on discord to get on, unless you want the hacker to continue to ruin the game while you send in game reports that no one sees cause no one is online.
I think it would be better to have a #help text chat on discord where you can ping staff instead, would be much easier to setup and could possibly help. And of course any misuse of this system would result in a discord ban.
You can /staff too get a staff to check it out quickly, and if no staff are online you can gather evidence and report them on the forums under "player reports". I don't think this suggestion would help or work all to well.