The phrase "afterwards at least" is correct and usable in written English.
It can be used to indicate that something will happen or be true following a certain event, with an emphasis on a minimum expectation.
Example: "We may not have achieved our goal, but afterwards at least we learned valuable lessons."
Alternatives: "at least afterwards" or "at least subsequently".
"Half an hour afterwards, at least five hundred people were watching his mysterious movements.
But if there had not been the military crackdown, even if some people were persecuted afterwards, at least the form of mass protest would retain some legitimacy.
Whatever the fate of the 2,000 Guineas winner Camelot at Epsom in 12 days' time, and whatever his destiny afterwards, at least one Triple Crown dream is still alive.
Much of northern Nubia was not inhabited for centuries afterwards, at least partly because of Egyptian military action.
ARR maximum value is reached nearly at the third year and displays a progressive and fairly regular reduction afterwards, at least until the end of the analysed time span, when it is apparently approaching zero.
Get your bird checked upon purchase and then regularly afterwards (at least once a year, or as advised by your veterinarian).
So when Harris and Swift split and Swift began dating Hiddleston soon afterwards, Hiddleston at least must have known what he was getting into.
"No excuses," she said afterwards, and at least a dozen times before Dettori and Golden Horn had even made it back to the famous winner's enclosure.
The match itself was a forgettable experience but afterwards we at least got the autograph of Greg "he's got no hair, but we don't care" Downs.
The minutes and voting records of its council meetings will remain secret for years afterwards: for at least as long, Mr Duisenberg has proposed, as anybody taking part in them still holds office.
"It's not always possible to dedicate time outside your working life to develop these social activities," she says, "And we get people who come to choir rehearsals and then go back to their desks to work afterwards, but at least they've spent a couple of hours doing something completely different".
