There are several aspects to your question. I want to be clear. To my mind, we need to distinguish candidates from leadership contestants. These are separate entities and separate contests.
In the case of candidates, what I put forward in my remarks is that the party becomes liable for those debts after three years, with no civil order or sanction for the candidate. The party itself may decide not to endorse that candidate in future elections.
Where we seem to have difficulty is with regard to leadership contestants.