Setting or plug-in to override font displayed?

Is there a plug-in or setting somewhere that I can use or enable to override the font displayed in a spreadsheet?

Back Story: I coordinate with a dept where all the users use Comic Sans Serif on everything. Cover letters, emails, you name it, and unfortunately, spreadsheets as well. After a year of this, I can't take it anymore. I can change the font the spreadsheet in question, but that annoys them and quite frankly isn't my place. They change it back.

Can I somehow set Excel to display this workbook in the normal Calibri font when I am on it?