Have a spreadsheet i want people to see on the web and give them the ability to choose the way they want to see the spreadsheet (VBA driven).

Have a spreadsheet i want people to see on the web and give them the ability to choose the way they want to see the spreadsheet (VBA driven), but i dont want the spreadsheet in the cloud or accessible to users, proprietary spreadsheet.

What would be the best way to approach this architecture wise?  Silverlight as a front end to excel services?