I achieved a level of success by using a 1" wide strip of plastic & securing it using self tapping screws to the inside of the top half of the door ('cos that's the half that opens inwards).
I had to make some small cut outs as appropriate but it seems to work reasonably well. The bottom half already had a metal strip on the inside of the door post to act as a restraint so I didn't bother with that bit.
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