stuck with num_tokens 256

[onmstester onmstester]

I noticed that currently there is a discussion in ML with subject: changing 
default token behavior for 4.0. Any recommendation to guys like me who already 
have multiple clusters ( > 30 nodes in each cluster) with random partitioner 
and num_tokens = 256? I should also add some nodes to existing clusters, is it 
possible with num_tokens = 256? How could we fix this bug (reduce num_tokens in 
existent clusters)? Cassandra version: 3.11.2 Sent using Zoho Mail