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The Edison discs can be safely played on a stereo cartridge (light tracking force is recommended). Any mono playback device that isn't a Edison diamond disc phono should NEVER be used to play a Edison diamond disc.
I also worked with what I have to have some 78 phonos. One of the more interesting projects was taking my late 70s Philips GA212 2-speed with pitch control and making it 78 RPM capable. On the surface it's only needed a extra resistor and a switch to work but I wanted a fancier implementation that didn't require drilling a new hole in the case so I came up with a more extensive control modification that I did a YouTube video on.
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