Your suggestion #1 isn't acceptable unless Intuit will reimburse the cost of using another service to replace a function that is supposed to be included within QBO without extra expense.

Since this functionality is supposed to be part of the product but no longer works because Intuit hasn't updated the export code to work with a modern browser, but has updated other code to the point that QBO is no longer compatible with the legacy browser Internet Explorer, your suggestion #2 is completely invalid, since QBO still tells you it requires Internet Explorer, despite what others are saying about using another browser. 

And your suggestion #3 has nothing to do with the issue.