It would take some more research, but a suggestion I got from ROC and ODY member Vertrkr is something I've done on one of my two Hondas (dropped the ball on the RL, but did it with my wife's Ody....
I used a mesh wire similar to one that is used for eaves on a house. You can get it at any hardware store.
I painted it black, used ties and it works just fine. It leaves ample air flow. The Ody has a 'lower' ground clearance and I was more concerned about that vehicle since I live on dirt/gravel roads. I did this three years ago and it looks like it may have taken a hit or two but no penetration, and no affect on the A/C or vehicle performance.
My wife has her Ody at work, so I can't grab a pic now, and I don't think I took pics of it.
I could not find Vertrkr's post on
OdyClub.com -- The Honda Odyssey Online Community but perhaps an email to him might yield some pics. He's still a member here and logs on so perhaps he can help out.
If I find a pic, I'll let you know, or post a link if I find is thread on that site.