what's the workarounds for landed cost in Global Procurement?

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we have this client where the requisition will be raised from US and the procurement will be executed by its trading company in Singapore, and the supplier is located in China, where the goods will be directly shipped from China to US and supplier invoice will be billed to Singapore, meanwhile intercompany AP/AR transaction will be created between Singapore trading company and US company.

the purpose for doing this is for tax saving, and I believe that's what most company will do for the same in terms of global procurement.

I've learned that fusion does not support LCM on global PO, if so, any other workaround to manage the custom duties and FOB expenses generated from this process?