How to Default Line Type Depending on Item, Is Defaulting Rules the best option?

I am trying to default the Order Line Type depending on the Ordered Item, through defining DFF for Item which containing the related Line Type then using PL/SQL Defaulting Rule to get the value. Defaulting Rule for line type is firing after creating the new line directly but before choosing the item from the LOV. Therefore, the defaulting rule using custom package cannot fit the requirement. Is there any way to do it?