[gumby79]

Yes are we talking the 03 in sig.
It is do able find a picture, cfd or video of smoke over the aera for your make and moddle would help make an educated guess on deparcher angle. There is an F-150 with theas oem up for studdy. The duct you speek of is called a diverging converging duct. Behind your opening you would flow the 7° -15° max ,however, vortex generators strategically-placed on the insides of Curves would allow you to exceed that 7 - 15° by slightly increasing the size of the turbulent boundary layer but still maintaining a laminar attached flow. Studd there use in FAA approved use to fix plains with bad manners in a stall. 15°off the direction of air move ment. You will have to account for the lost cross sectional flow aera on the easy high pressure out side. A dirt road @35mph following safe distance, but in the dust trail with some video would give you a wind tunnel in free air so to speek.

The central high presher zone would give you the highest pressure differences = highest flow. That is why Aerohead used that aera for his cooling entry.
You could do something like this . Short ducts from the fog light buckets or go from the center.

https://www.bodykits.com/i-24306591-...ip-490187.html
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hope the reading and ideas help the time go by with a bum leg. Best of luck with the recovery