No change since my last post. We have a several options to get over this problem:
1. Volunteers grit their teeth and clean the spreadsheet by hand. It's not the kind of work you'd want to do for free, though.
2. We find a volunteer for technical manager who has the right programming skills to clean the spreadsheet.
3. We come up with a workflow that doesn't involve the export at all.
Or maybe someone has other ideas?