We've tried nothing and we're all out of ideas!
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You'd probably be able to do that and win the match, but, well, there's a few problems...
First of all, Addis is a Tymoran priestess with level 5 spells, so she'd be pretty difficult to take down quickly unless you were serious adventurers. Chances of pulling it off without a hitch are non-zero. We don't know for sure what is and is not on Addis' spell list, but if we imagine it's similar to Konsi's list well... Konsi always has Dimension Door prepared, grabbing her would be very difficult.
Secondly, this is Konsi's boss, you might win the match by default, but the repercussions within the temple would be much worse.
Third, Konsi would never approve of kidnapping anyone who wasn't evil... She's too much of a good bean.
Probably the biggest problem is that the entire point of this match is to have Konsi play a high-stakes poker match under scrutiny, to prove that she legitimately has skill at the game, and doesn't cheat. They're staging this whole thing to head off accusations of foul play... Kidnapping your opponent and winning by default doesn't exactly solve the problem!
I know that it would be out of character, but now I'm trying to make up a plan how this might work. If Mystery can counterspell, then if you send him along while disguised as someone else, it might be possible.
However, as you've said, it would not really accomplish much anyway and Konsi would never do it.
I have been informed of a good chunk of lore lol that does change things.