What is very unlikely to be on the table is for them to declare that redress is available and for them to then draw up their own rules for being able to claim it - which I'd suggest would be their ideal outcome if forced to make provision on their own. The commission's papers already say that individual funds have to also have totally independent means of making a claim so a survivor never is forced to deal with an organisation itself.
Using the commission's figures, with the known number of survivors, and one suggested average figure for redress for each, it comes to a potential liability of something like $113m (Aus)/£53m/$83m (US). One of the WBTS' arguments, even to this commission, has been that they should only be held liable for abuse carried out by elders and ministerial servants. That hasn't carried any weight whatsoever with the commission, but when O'Brien talked about 'fairness' of proposed schemes that is the context.
Can see them trying to drag this out for as long as they can really because it very much makes them not the special snowflakes they try to pretend they are, but yet another religion with a serious issue which handwaving away hasn't solved. They'll use 'be no part of the world' to defend this. Until the bad publicity becomes too much, and the court cases are lost and they realise this may be cheaper than paying £1m a time to the lawyers in each case, and then they'll decide it's like an insurance scheme so scripturally fine after all.