Absorbing Landed Cost without the manual complexity of Trade Operation?

Summary:

Is there any simplified manner to absorb Landed Cost into the SCM subledger without the manual complexity of Trade Operation? For example, a simple Freight field on the Purchase document header, or an appended Freight line on the Purchase document? Or - given the complexity and manual nature of Trade Operations - has anyone successfully leveraged the REST APIs it to automate the creation, matching, and application of the Trade Operation?

Content (please ensure you mask any confidential information):

Use Case 1 - Supplier Freight

1. Place a PO for Items "A" and "B" with Supplier "ACME".
2. Include $500 of "ACME" freight into the PO either on the header or line(s)