Thinking back to my time in grad school, I feel that the list of things I would have come up with as negative societal consequences would have at least outed my

Thinking back to my time in grad school, I feel that the list of things I would have come up with as negative societal consequences would have at least outed my political opinions and at worst made me look paranoid. You could greatly mitigate the political aspect by not attaching a value judgement to which foreseeable societal consequences should be disclosed. You might be able to mitigate the second effect by having some guidelines about likelihood and how long-term the consequences need to be. Over time, people will probably turn this task into copying and pasting a standard list for their research area. Existing researchers still mostly won't have to think about societal impact, but maybe it'll have an effect on which research areas people choose to work in.