re-using old license plates

Got my car finally in my name in Oregon. The Oregon DMV also allowed me to put back the original 1967 Oregon plates as custom plates. Had to pay an extra $100.

My question is this: The old license plates have a Year tag from 1967 which I would like to keep displaying. Do people here have a way where I could drop down the new year tag when I'm driving it around and a way to pull out the year tag when I want to display the 1967 one? I was tossing around maybe a velcro folder with magnets, but maybe someone here has a better idea.

Thanks!
Paul