Im thinking a very different Ultimate Computer for alt universe movie three.
The Enterprise is testing the M5 just like in the original episode(replace the other four Constitutions with a mix of the Kelvin-bash fleet). The M5(still created by Daystrom) being a result of a sudden and succesful full scale invasion of Romulan space by the Klingons a year prior. The Klingons killed half of the Romulans(including all important civilian, government and military members) and enslaved the rest. The Remans btw would be all but wiped out completely. Right before the point the M5 goes haywire in the original episode a Klingon task force shows up and a skirmish begins. The M5 works this time and four of the five Starfleet ships survive the attack. Then Kirk and company quickly learn that this was not isolated to say the least. Over 2,500 Klingon warships have made their way into Federation space. Many of which popping up deep inside of Fed space due to cloaks aquired from the Romulans and giving the Narada a mention. The final fight would be a full on WW2 style furball involving over a hundred ships from both sides. The Enterprise would be kind of seperated from the main fight and would be going up against two Klingon ships on its own. At the same time dozens of Klingons would be beaming aboard the E and hand-to-hand and close quarters combat would commence on many levels of the ship. The Klingons eventually lose but both empires are left in disarray in their own ways. This leaves the perfect opportunity for the Romulans to rise and overthrow the Klingons.
The next part is what happens afterwards setting up either a fourth movie or the next series.
The Romulans, forced to make friendly with other spieces to somehow find a way back to glory happen upon both the Tholians and the Breen. They form an alliance and things go on from there.
