It would be a risk. If King managed to intervene in time, he would know exactly what we intended for it.
[Thinks some more. :|aa]
Ideally, there would be another distraction elsewhere to draw Ophiuchus away from the arena, too. One group to draw Ophiuchus, as many as could be spared, two people to destroy the symbol, three or four to take King's.
It has potential- but to be honest, I have doubts about whether we could handle King just yet. The symbol we took last night was probably Veiled's. She isn't terribly powerful. She hasn't held a game in a long time. Most people forget about her. And yet, even shielded, we felt her influence so strongly that we nearly were put to sleep, too. If his influence is "order," it's likely that those under its effects will feel compelled to maintain the order of this place- and a turncoat, even an involuntary one, is something we absolutely can't risk.
It might be wiser to locate King's symbol and set about a campaign to undermine his control, first. Destroy the lesser judges. Do the unexpected- a game boycott, maybe. Let it build up. Weakening him before we attempt a retrieval will probably reduce the risk somewhat. Queen will grow stronger in response, but her symbol is safe in your hands already. She can be checked, if needed. It's him we need to be concerned about.