[Q]

HP, I did somethong very similar to what you proposed for cloaking: 5 cloaking devices for each sensor ability. It works well for human players, but it turned out to be impossible to make the AI use more than one cloaking device on a ship.
And personally I think it should be generally possible to defeat any cloaking device. I didn't like the situation in SE III when you had absolutely no possibility to detect cloaked ships in a system.