Most of the fry are tiny and not even a half an inch in total size so I wouldn't want to do a salt bath as I think a sudden and massive change in salinity would be a bit too much for them at this point in time. Plus I don't want to be handling them too much as they are quite delicate. It was hard enough catching all of them from the parents' tank.
Going to just do the final treatment today and then do a large water change and gradually add salt and up the temperature by a couple more degrees.