no MJ is completely safe from the floor rust. there are a dozen places that can leak and even a car wash can then put moisture under the carpet. fingers crossed though!
my buddy has a door key to his old truck ziptied to the underside somewhere. MJs have 2 separate keys so the door key on the underside would only give the thief the same access as a rock.
nice! that would sure put a smile on my face every time I needed to run into town. I doubt any of the other cars in the parking lot give the same level of happiness.
I'd wager you could use heat to bend the head of an old toothbrush and use as a little scrubber. heck, you could even use toothpaste as a mild abrasive to polish the inside.
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chances are those backup lenses are just super fogged up.
do you have power going to the reverse bulbs? power coming into and out of the switch? those should probably still function so people know you're backing up in a parking lot.
and I would totally put those into that bumper as aux lights.
I think what I would do is make one for myself and then put it up for sale to see if someone bites. As long as you make it something you'd like to have, you win either way.