The other co-accused applied to the High Court for a stay of the prosecution on the grounds the actions of the police during the investigation were so against acceptable practice they amounted to an abuse of process.
In October, Justice Simon France in the High Court issued a stay on all prosecutions of the 21 accused after police were found to have committed "fraud on the courts".
Police were found to have manufactured a fake search warrant, created an invented signature of a court official to back it up then staged a false arrest of an undercover agent.
Wilson appealed his conviction after the stay of prosecutions that allowed his co-accused to walk free.
The Crown opposed the appeal, but in a Court of Appeal judgement Justice French allowed it.
"I accept that it is only in exceptional circumstances that this court will entertain an appeal against conviction following a guilty plea.
"However... it is in my assessment more than arguable that should Simon France J's stay decision be upheld on appeal, it would be a miscarriage of justice for the appellant to be denied the benefit of that decision," said Justice French in his decision.
Wilson was released on bail until the appeal.