Allocate invoice Freight/Surcharge cost to purchased items on pro-rata basis

Summary

We don't have Landed Cost Management implemented, but we have a requirement to allocate invoice Freight/Surcharge cost to purchased items on pro-rata basis such that it updates item average cost.

Content

LCM may be a standard solution for the above requirement, but I wanted to see if anyone in this community has ever come across this kind of a requirement  without LCM and has found an alternative way to address this. Any help or suggestions will be appreciated.