Back in the days of Methuzelah, when film cameras were generally of the 35mm format, it was common to wind the film fully back into the cassette. Sometimes those of us who were pfotographers rather than snapshotters would need to partially rewind a film to change from black and white to colour or to change to a film with a higher or lower emulsion speed (ASA or ISO rating). The partially used film could then be put back in the camera and the remaining shots used. Film and processing was expensive!
If the film leader tab happened to be rewound into the cassette it was easy to remove by simply sliding a thin piece of plastic or metal, like a feeler guage, into the mouth of the cassette and then turning the spool backwards. End of the film would just pop out.
I can see no reason why a similar technique could not be used with APS film.
Personally I use an Epson Perfection 3490 flatbed scanner for digitising slides, negatives and prints and have found no problems with colour shift, even with some slides which are over 50 years old.
Colyn.