How to set Calculate Estimated Landed Cost field to Yes on Item Receipt via Workflow?

Any help on the following would be greatly appreciated.

Background: trying to find a way to account for landed costs when using WMS! This triggers multiple item receipts (IR) per PO.

We have dismissed using Inbound shipments (too flaky/unsupported)

We are therefore trying to use estimated landed costs. Everything set up as should be. All works fine in testing via UI. HOWEVER - the "calculate estimated landed costs" field (CELC) on the IR is not copied across from the PO when creating an IR via the mobile app. Support have confirmed this behaviour is as expected! This means the landed cost estimate is not triggered. We can manually open the IR in edit mode and set the CELC field to Yes and everything then works as expected. Naturally I cannot do this manually with 1000s of IR.