SABS wasn't necessary for their precision.
https://en.wikipedia.org/wiki/Mark_XIV_bomb_sight
It was around since 1939 and continuously improved getting and average similar to the SABS.
Creep back was actually something that really only impacted very large bomber raids, if you're using a few dozen Mossies that's not going to be a feature.
In squadron service the best the Mk XIV got was 195 yards with two special squadrons and 270 yards in widespread service. What's more these 'high' accuracies were not achieved on regular 20-30,000' altitude, high-speed bomb runs but at 10-16,000' at lower speeds which negates the single advantage of the Mozzie; performance.
Assuming a Mozzie bomber force could get closer to the 195 yards like the PFF, Master Bombers and other special squadrons were able to achieve (by special, low and slow bombing techniques that bring it into the engagement envelope of regular defences) it would still not be accurate enough to dispense with large numbers of bomber per raid which introduces more inaccuracies and things like creepback.
I think the loopholes in the technical details, such as the inability to match the Mozzie's peerless performance with the requirements of 'precision' bombing would only allow a modest rebalancing of Bomber Command toward Mozzies with any serious expectation of better results.
BTW, the RAAF is taking forever to restore the one at Point Cook Museum, they're done bugger-all on it for years.