Can't you just stick a small length of timber batten between the jamb/stop and the face of the door that the hinge plates are screwed to?
That's what I'm doing at the moment (with a roll of kitchen roll) but with small fingers around I'd prefer something a bit better.
@aggi started
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Can't you just stick a small length of timber batten between the jamb/stop and the face of the door that the hinge plates are screwed to?