I cannot find anyone talking about rice weevils in my language online, so I really doubt finding them is a common thing everywhere. If it is that impossible to get rid of them then it is probably a climate thing, they are common in your climate but not in my climate.

So the advice would be to look at local pests and how to avoid having those in your storage. We still have other kinds of weevils but they are not everywhere like you say rice weevils are, you are unlikely to have them in packages meant for humans so storing things long term is fine.