Pro Micro QCM1250, I/O module knock-out port cover is bad news

When trying to open the cover of our new Dell Pro Micro, I accidentally pressed on the knock-out port cover and it almost collapsed. According to the owner's manual you're supposed to remove it with a screwdriver, but it's apparently flimsy enough to remove with moderate finger pressure.

So this poses a risk of short-circuiting. And to make matters worse, Dell doesn't provide anything like a plastic plug that you can use to fill the hole when the port cover is removed. So what is someone supposed to do if they install an optional I/O module and later decide to remove it? Leave a big hole in the chassis?

It would have cost Dell a few cents more to have a screw-on plate cover instead of this wimpy too-easy-to-remove punch-out. And it seems like offering an insert to cover the hole should be mandatory. Very disappointing.

In our case, the knock-out plate didn't completely come out, so we'll need to figure out how to protect that area so that there's no risk of short-circuiting or someone accidentally sticking their finger in the chassis.