The article says that 80% of visitors are there primarily to see Mona. If it’s about satisfying a certain element of visitors, here are some other suggestions;
Make a bigger copy, no bullet-proof glass needed, set it up in a special room, and put a selfie platform in front of it. Hey, it’s still in the Louvre, so it would still count, right? The Lascaux caves have done this for a long time now, so it’s a proven idea. There could even be an express entry and exit for the room, so that interested visitors could get in and out of the Louvre quickly, and on to their next destination, without disappointment.
Create one of those “immersive experiences” that seem to be cropping up. That would be interactive, huh?
Have the Louvre take a photo of the customer, then superimpose it on a background of Mona, or whatever. Taken by a professional, without any need to wait for a perfect shot, and with limitless options for the wallpaper in back, it could be profitable for the museum, and everything many visitors really wanted.