MARLIN--- Here's a suggestion. Inside the two(2) vertical support bars directly in front of the grill/radiator area: Use heavy-duty black "Expanded Metal" instead of solid diamond plate. The Expanded Metal mesh will allow cooling-air to pass directly into the front radiator, while still offering frontal protection.
They make various levels of heavy-duty Expanded Metal mesh, and you could get some of the really beefy stuff that is used for truck "cab guards", etc. Do a internet search for "Expanded Metal" to get some ideas for various strength levels.
On the outer side corners of the two(2) vertical support bars (left-front & right-front), you could still use the solid black diamond plate for protection as originally planned.