As a former criminal mastermind Artemis has no reservations about kidnapping someone just to use their body parts, since in canon once he pretty much PLANNED for cutting off a man's thumb just to get into a super secure safe. But considering the whole death/mutilation aspect of cutting off someone's wing he'd be more likely to suggest attempting to reprogram the wing scanner to recognize the wings of one person in their party, if only because a kidnapping can get messy in a high security situation especially if they're caught.

As for structural weaknesses to introduce, changing the carbon bonds in the alloy would definitely be a place to start. Drastically changing the amounts of alloy components might get noticed faster, though. So Artemis would recommend changing the formula just enough to lower it's breaking point to make it more easily damaged. There's also the question of how they might try and sabotage the batteries.