Try something like this

It goes into the worksheet module, when you right click on the range
A1:A10 a check mark will appear or be removed from the selected cell.

Private Sub Worksheet_BeforeRightClick(ByVal Target As Range, Cancel
As Boolean)
If Not Intersect(Target, Range("A1:A10")) Is Nothing Then
Cancel = True
If Target < "a" Then
With Target.Font
.Name = "Webdings"
End With
Target.FormulaR1C1 = "a"
Else: Target = ""
End If
End If

End Sub