Why ? If you wrap the message into multiple layers of encryption (TOR style) that needs to go into multiple nodes, and if alongside the next encrypted layer you have a date the nodes agrees to wait to pass the message to another node, that would work, no ?

Even with some corrupted nodes, the message would still be secret, the only issue would be if the last nodes are corrupted : your message would be distributed too soon. But with enough layers and enough nodes to go through, you could mitigate this risk.

The network could even detect corrupted nodes if other nodes received the message too soon.