I grew up in the South Alabama, North Florida and we have Lovebugs and the only way to stop from replacing your radiator and anything else is put a bug screen in front of the radiator. All it is window screen with a band around it with mounting rings. Our vehicle do not over heat. This is replace as needed when they fill up with the bugs. If you do not wash the vehicle everyday then you will have no paint in one season.
I now live out West and use the screen on all my vehicles to keep out the bug and flying things. We get up to 110 last year and non of our vehicles overheat. We must be lucky. Been doing it for over 50 years.