Locking view when sharing

Hello,

I have used Smartsheet for some time now, but just started investigating using Card view.  Unfortunately, Card view cannot be used on a report.  Previously I had a report that combined my personal tasks as a manager from one sheet with tasks from my involvement in projects my employees are working on to create my weekly to do list.  I would like to do the same, but view in Card view.  I could do this if we all shared the same sheet with different filters so that they could only see things they are assigned to, but I don't see that you can lock that filter so they cannot remove it and see confidential tasks.  Any ideas?  How else could this be accomplished?