This dispute has gone way beyond negotiation over pay and conditions. There cannot be any discussion until those 52 pilots are re-instated. Had this happened in UK then I suspect that all pilots in the company would have downed tools immediately and the company would be on its knees within days. sadly Hong Kong's labour laws prevent all out strike. However pressure must be increased by any possible means.
CX you have the support of every reasonable and responsible pilot in the free world. Keep up the fight and get those pilots their jobs back - next time it could be you receiving a DHL letter!
Good luck and best wishes.