Why don't you just send them the Excel file? Am I missing something?* The only problem you'll have is co-ordinating all their changes. The only thing to watch out for in sending them an Excel 2010 file is that some of them - probably most of them - will have an earlier version of Excel, in which case you may want to save your version as a .xls file and not a .xlsx file.
- Ah, I just thought. Possibly many of them don't have Excel at all... In which case, I really don't know how you can do what you want to do.