It regulates how quickly the oversupply comes into the market. The exim bank is able to wait longer to sell the supply of a good so they can price the good appropriately. If a company is forced to sell their product to meet cash/liquidity needs then they would sell their goods at an unwarranted discount.
This sounds like a job for a company, not for a government entity.
Let Overstock do it. Or let them buy insurance.
If its not a viable business, then its not a viable business. Let the people do something productive instead.
Taxes ought not be taken by force of law from the widows and orphans to pay for the subsidy of business decision failures by protectionistas.
The markets price goods appropriately, not a government.