From various Gedolim stories I have heard over the years, it sounds like the Gedolim don’t approve of that type of approach.
Also, it doesn’t help in the long run. When they find out they have been fooled, they will be mad, and it will backfire. You have to be seicheldik about these things.
You’re dealing with people, not with machines. You can also take someone and tie him up so he won’t be able to be mechalel Shabbos, but that’s not our approach. The point is to get him to do it for the right reasons. We don’t force people to keep Mitzvos because that would be missing the point. The point isn’t to get the Mitzvos to be kept – the point is to get the PERSON to keep the Mitzvos because it is good for him and connects him to Hashem. If it’s done out of force, it is meaningless. Tricking people is similar.