We deeply regret the difficulties
No, you don't. Or else you would have had some sort of measure in place like temporarily taking on some extra staff in order to run the two systems side by side in order to verify that the new system works correctly, before decommissioning the old.
The factory where I work changed its clocking in system and its track and trace system, and both were run together (yup, we had to beep in and out twice) because it's basic traceability. If you're trying to be ISO-any-numbers you simply cannot simply switch systems and just shrug until the shit hits the fan.
What I deeply regret is that your negligence injured people, and the best you have to offer is pointless platitudes like "deeply regret" and "remain committed". Management, don't slam the door on your way out......