Oh man that's unfortunate.
The safe message is normally related to keys and I have had it after a battery disconnect but it sorts itself out.
As for the gearbox solenoid can you copy and past a fresh scan of the car after trying to clear out faults first.
Did you also check to see if gearboxes matched part numbers as there is options depending on years.
If that all checks out the only short cut you could possibly try would be the mechatronic unit from inside the gearbox.
But personally if I were you and I would go straight at replacing the box with your known unit that you serviced.
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