@m0zah Great meeting you too! If it makes you feel any better, I only knew this trick because I watch Deviant Ollam's Youtube videos and talks on tampering with "tamperproof" devices. He did a video on how to save festival wristbands.
@philpem Oh, that would have been sensible! I ended up giving up on the screwdriver approach - wasn't getting anywhere like enough leverage - and just took a junior hacksaw to it and peeled the crimp apart that way.