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Well I used a Weller soldering gun for this purpose many years ago. The model I owned had a thin, flat circular disc tip, about 1cm diameter, that I think was intended for some sort of craft purpose - these kits were sold as being suitable for burning your name etc into wood, polystyrene cutting, bag sealing and many other uses as well as soldering.
I found that quickly running the heated disc tip around the seam of the screwless cassette melted it loose in no time at all.
It's also possible that something similar could be fashioned for any type of soldering iron with some careful thought.
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