Assigning item overhead cost elements to different accounts in WIP material event class

Client has setup multiple overhead charges against each item which vary based on custom cost calculation process.  Example is sourcing overhead which is calculated to each item based on brand and product lines.

When work order is completed, all the overhead charges are credited into WIP accounting class overhead charges and debited into finished goods.

Client would like to credit each overhead charges in different account codes using SLA. There is no sources available to change the account codes in WIP material event class.

How do we achieve this through SLA customization?