I'm sorry but no. First off, while nukes might be real, and the idea of tossing nukes in space are real, actually implementing a new weapons system (since two matrix crashes and multiple waves of global craziness probably means those plans aren't there any more) requires extensive time and testing, something you can't do with a weapon like this. This isn't like getting the local machine shop to make you a Colt 1991. We're talking orders of magnitude difference here.
Second, there would be no debate in the Court if someone unleashed 20+ orbital weapons all around the globe. That is instant Omega Order, period. Everyone will dogpile the offender and rip them to bloody shreds without mercy, because they know damn well that if the message isn't sent, then you might be on the receiving end at some point. That is the whole reason that orbital weapons require approval of the Court! Plus, you're either ignoring or forgetting that at least four members of the Court have very close ties to some of the Greats, including two that are literally in official positions of power. The Corporate Court will BURN YOU TO THE GROUND.
Third, go back to the point where I mentioned several posts back that Dragons have Edge, and can spend (or burn) it in all the same ways a normal character can. Guess what? That also includes the 'escape from death' thing.
Fourth, how in the hell are you going to get actual, real-time positions on all the greats simultaneously? Especially considering that they can take metahuman forms, know magic that can easily hide them from orbital scans, and so on. Hell, when Dunkelzhan died, all the dragons gathered to do the death dance for him, and not a single camera in the entire city managed to capture a moment of it.