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If this goes forward, I would consider using Google Docs - they have a spreadsheet that is basically a simple Excel - wityh the advantage of being editable by multiple people, one central doc, history of all edits made (revertable to older versions in case of mistakes made), etc ... you can create it in Excel and anyone could upload it to Google Docs and make it public, perhaps with a small set of trusted editors.

https://docs.google.com