I'm not sure you can divorce this from the question of whether it is a good thing.
I can think of potential mechanisms - volunteer-honorary contract - undertaking etc. but if it is a bad thing (and I am assuming access to PD involved) how can a bad thing meet the requirements of "appropriate organisational measures".
Where is your due diligence / IG training /policy training etc. What is the non-employees status as a controller (or not?)? Where do you stand if they change your mind and do not sign a contract?
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