Landed costs - Applying tarrifs based on Item class

We have a prospect who is ready to purchase Acumatica but have run into an issue with Landed costs.

The prospect imports multiple items with different duty rates in one shipment from one vendor. When applying landed costs they need a way to parse the items that by class in order assign different duty rates.

I thought of 2 solutions and need to know if either path would work:

1. Add an Item Class filter to the Add PO lines panel or,
2. Add an item class column to the landed cost TAB detail section

Solution 2 would be ideal, if I understand properly, because it would allow a user to add multiple custom codes that would apply to only a particular class of goods.

Am I correct? If so I will look at doing the modification.