Force replication to statement for INSERT to a table to fire trigger on slave
As documentation say

With statement-based replication, triggers executed on the master also execute on the slave. With row-based replication, triggers executed on the master do not execute on the slave. Instead, the row changes on the master resulting from trigger execution are replicated and applied on the slave.
This behavior is by design.

So in anycase statement/row, you don't need to be worrying about the data on slave and it should match the master.
but still if you want and can fit-the-logic on an event, this might be a possibility on slave at the risk of inconsistency!!
As you said this is dw slave, would you consider a separate process to do the task you're looking to do, say a procedure?