Francois de Dietrich has been given a date in January for his appeal against an 18-month term imposed on him in Belfast for contempt of court.
He will try to overturn a jail sentence by claiming an order to fully disclose all his assets was draconian.
With a warrant out for his arrest, he was last seen in France, after a BBC Spotlight programme tracked him down.
People on both sides of the Irish border fear they may have lost millions in investments in liquidated stock.
Court proceedings launched by the Financial Services Authority in the North led to an injunction banning de Dietrich and his company ETIC Solutions from taking any more deposits.
The regulatory body also obtained an initial order freezing more than £20m in assets linked to the businessman.
De Dietrich was then held to be in contempt of an order to disclose his global financial affairs in full to the FSA.
He is preparing to contest that finding on the basis that there is no allegation of wrong-doing outside of Northern Ireland and the Republic of Ireland.
It will be contended that he has complied with requirements to reveal all his business interests on both sides of the order.
On that basis his legal team are expected to argue that imprisoning him was an excessively draconian outcome.
De Dietrich has denied any fraudulent behaviour and, in a statement through his lawyers, claimed to operate legitimate businesses which have been unable to trade due to the legal action.
The Court of Appeal was told yesterday that his challenge has been listed for a one-day hearing on 9 January.