Kee 3.8 (in beta testing now) will not overwrite fields if they already have some content in them. It’s a bit of an experiment and may be reverted before 3.8 is officially released if I hear that the behaviour is generally undesired so please test it and let me know in a week or two whether it has solved the problem with the DokuWiki move plugin or whether it has introduced new problems that are worse than the ones it solves.