Hi Steve you could try this below.
Purchase a curtain hook, and also use an electric connector fig 1
1
screw the curtain ring into the connector, and then crimp it.
2
Push the door cable into the other end of the connector and crimp, open the curtain hook and put it through the door handle puller
3
Close the hook bac up and put wire through the slot in the handle.
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These are what i use.
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I made a few up recently in hope we may have a Nano meet in the near future
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Alternatively you could use a chock block and some wire as below.
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8
Originally i used and earth connector
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a few ways there for you