Hahaha it's such a lovely idea! Turning the opponents detection against them, I very much dig it!
Here's a caveat though: Attackers will at some point notice scarecrows and simply work around them. Now suuure, if you have a better lock than your neighbours, that decreases your chances of getting broken into, but in the end this is a classic "security by obscurity" measure. So if your time and computer/data is valuable, I would rather invest in other security measures (firewall, awareness training, backups etc.)