Initially, I was looking towards doing the same thing. Maybe lifting it a few inches, enuf to fit some nice AT's under there and have enough clearance to drive over anything higher than 4". We get a lot of snow here and the powers that be in Montreal have figured that it's cheaper to not plow the snow after every snow storm if another is coming in the next week. Makes finding parking at work very challenging.
With my FJ, clawing my way to the top of a frozen-over snowy hill made my day. With this thing, I'm always worried I'll rip the spoiler off.
I think your idea is awesome, especially if you can lift her a bit.
Best of both worlds; 470 horseys and actual Jeep worthiness