I don't understand your issue very clearly.
From my perspective, important point is to get a starting proposal, even a few words, to process the tension. So you can apply the IDM process. Through clarifying questions and reactions round, proposer will be able to get a lot of informations about his/her original issue. After that, he/her might clarify tension and amend proposal, or drop the proposal waiting for more maturation.
Hope that helps,