Well at this point, if you genuinely believe Corbyn is a remainer, then I'm not sure Labour's policy could be any worse. At least that scenario would remain true to the ideals that Corbyn supposedly embodied.
More realistically, I feel that Labour should have strongly come out in favour of EEA. Yes, that would have been unpopular with hardcore Brexiteers, but they were never going to vote for Labour anyway, and didn't have to be convinced. It would also technically have respected the leave vote whilst recognising that 48% of people also did not vote to Leave. At the very least, it's a consistent coherent policy that would have given Labour the actual authority to oppose the batshit policy of the Tories so when things did go tits up for them, Labour would have come across as a safe pair of hands that actually understand the issue. You might claim that that would see Labour seen as effectively a Remain party, but it's the lack of voices in favour of a Soft Brexit that's allowed the gradual hardening of the medias Brexit stance. On the 24 June Hard Brexit was seen as a ludicrous interpretation of the referendum result.
Anything is better than the policy that has had the Daily Mail penning effusive op-eds congratulating Corbyn for his success in shutting down Remainers.