As far as their honor and reputation goes, they are totally fucked. They can't return to City Harvest to make a living. Outside of the Church the only scam they can perpetrate is to do Herbal Life MLM jobs. So what is the option?
I propose they face up to their shenanigans and deeds. Tell the truth in a jointly authored book admitting they benefitted from the retroactively named "Crossover" project which was in reality a con job to fulfill Sun Ho's silly and narcissistic dream of becoming a pop star and to explain in detail how it was done.
I believe once they had served their time their ill gotten gains cannot be touched by the law.
By making the threat of a tell all book, who knows the Sentosa Cove penthouse may be put on immediate auction to pay off their silence.