The thing is, as Bob pointed out above, that could lead to disaster in this game. A disaster where you didn't really have any influence one way or the other beyond befriending the Dyson Sphere. AI War is an asymmetric wargame, where you spend almost the entire game totally outclassed by the AI opponent. With my AIP suggestion at least there are in-game tools to mitigate that sort of penalty, Data Centers, AI Superterminals and Spire Civilian Leaders are the ones that come immediately to mind. An ally who triggers border aggression and alerts all over the map would bring a crushing defeat down on you pretty quickly. Or the game quickly becomes a snoozefest where the Dyson does the majority of fighting.
I don't mean to be condescending, but my suggestion makes it such that they will only attack planet you, 1, have a significant force there already (so a single raid starship will not trigger it), 2, they will only go in after you have been there for some time (so popping in and popping right back out will not trigger it), and 3, it will only be for planets adjacent to where they are already patrolling (thus, they will not unintionally deep strike planets you want to be left alone).
I think these three caveats prevent any of the unwanted, unexpected threat stuff you are worried about, as they will only attack a planet that you were clearly trying to attack heavily to begin with.
Maybe I should add these three points to the comments in the suggestion report, so others don't get scared by it as much.