Just out of curiosity, if your players said their characters were trying this procedure, would you:
1. Just flat-out say, "No, your characters are not doing that."
2. Say, "Your characters can do that only if you the players can give me an in-game, in-fiction reason your characters would do it - and only if I judge that reason to be acceptable to me."
3. Actively help them come up with an in-game, in-fiction reason.
Not quite any of the above.
I'm not going to let them go through a whole bunch of discussion and come up with this scheme without speaking up. So, I'd be explaining the issue with that well before it is declared as the plan.
And, as GMforPowergamers says, since we have a Session Zero in which we set ground rules around metagming, that'd be enough for them to rethink, and either give me a in-game reason, or take some other action.