Just think of it this way: two Striker Eurekas in Hong Kong. Let me guess: 'Tachi and 'Back get curbstomped in 20 seconds flat while the old-timers chill in the harbor. Slattern is flatlined in 60 seconds. Two thermonuclear bombs detonate inside the Breach, screwing the 'Cursors for 20 years. But they do come back because... why not?
Hong Kong would probably end the same way; Striker gets held back and Gipsy remains grounded, Bracer, Cherno and Crimson are deployed to defend the harbour. Having 2 Mark 4/5 Jaegers on the frontline could potentially change how the Kaiju act, possibly Leatherback employs its EMP first, disabling the Mark 4 and 5s. In a 2 on 1 fight, Cherno is overwhelmed and destroyed, but Gipsy arrives and potentially saves the rest of the Jaegers from destruction.
Pitfall goes ahead as it was planned, a 4 Jaeger drop with Bracer on point, Gipsy and Crimson on the flanks and Striker at the rear. The 3 Kaiju guarding the breach are killed, maybe at the cost of one or two Jaegers. Assumingly the information about the breach gets through, allowing Striker to grab Slattern and jump into the Breach, releasing the payload and getting out of there and ending the war. The Precussors return, possibly earlier than they did in Uprising, because in this event the Breach is destroyed, but the Kaiju production facility remains intact.
The PRU jaegers move like goddamn power rangers, put one of them in PR1 and the cast's survival rate goes up by 65%