Anidea: I don’t understand your premise. If a child of divorced parents is emotionally healthy because of how things were handled (understanding it does take some time to get to this place) – the parents are each basically decent people and got their acts together and were determined to work together in the best interests of the children – why should it be a problem if they are involved in their kids’ lives?
Now if you’re talking about someone who is emotionally healthy not because of how things were handled but in spite of, I understand such concerns. If my kid was offered such a shidduch but was young, and might have to deal with some hairy situations, I would say, this might be the right one but not the right time. But a mature young adult who could handle this, with the proposed shidduch having the tools to deal with this, not necessarily a problem.