Oh god that is hilarious, in the best way.
Nuke Eye? Stealth Guard Posts? Send in the entire fleet, spot the stealth guard post, then RUN! What's that? The AI spawned a gravity guardian? Tough luck, your thirty seconds are up.
edit for context: I'm not mocking your suggestion for 5:1 revealing cloaked, just having fun imagining the worst case scenario.
Edit #3. For what it's also worth, what about Stealth Guard Posts decloaking when the AI no longer has control of a system. If you're willing to take out the command station before the eye...