I would think that the way the hood is designed, if you tried to "stretch" louvers or a cowl style into the hood, the sides are just going to buckle. Just my 2 cents.
I have done a lot of bodywork in my time with Jeeps, and trying to change a flat panel without heat to make it expand or a die to press it, is going to be near impossible.
I believe that a custom built hood is in your near future.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...