I am wondering if the following can be done:

I have used the Zone Rates shipping module to set up shipping prices for different parts of the world, depending on the weight of the items. These are shipping rates for insured, traceable shipping. This is nice.

However I would like to give customers an additional, more economical shipping option for orders below a certain total price. So, e.g. for orders <$50, I want to offer a cheaper, non-traceable shipping options, either in addition to the former, or to replace it. This cheaper shipping option must also be set up with different prices depending on destination and total weight.

How can I do this?