Here's another way of handling this, which works both in game and in story.
"In my land, I would kill you out of hand. But we are not in my land. I demand a lock of your hair, a drop of your blood and spittle, and a slice of your skin, which I shall keep in a locket. If you should attempt your mischief again, I shall use these to curse you and you shall die. Should you try to steal the locket, you will die."
I'd then insist on these things, and refuse the foot-kissing. This establishes your character as different from the rest of the group, but no so different that cooperation is impossible. Also, with the items listed you should be able to cast spells at the trickster without overcoming his MP, and maybe even without him being in range. (Yes, I know, that's not in the roolz; but if the trickster believes it, then that's good enough if his player is a roleplayer.)
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