IMO your biggest concern will be rocker panels and dragging your butt
Even lifted (2.5") I drug the ass end of the LX all over on Fins. I don't recall any concerns about the rockers on Fins but I have sliders. With your length though, you'll want to really watch them as the expense to fix the rockers will make the cost of sliders look cheap. If you have a hitch on the rear that "should" protect the rear although the bumper corners could see abuse.
I've never been on Sevenmile Rim
As for alternatives...Of the trails I've run, the only one I can think of that might be a good alternative is Hells Revenge. I don't recall any rocker panel concerns on that trail and I think the only big obstacle left (tip over challenge) that we can do during CM has a bypass. Porcupine might be another trail if you are careful, but that was the first trail I ever ran and the first one I hit my sliders on (driver error)
Trails I've run are Porcupine, Poison Spider, Fins, Hells, Metal Masher, Wipe Out Hill, and Tip Toe Behind the Rocks