Does your spare have to match? Could just get a cheap steel rim and cover it with one of those cosmetic Jeep logo covers. I had one once, but had to remove it because it would trap salt and decay the rim fast.
I don't bother rotating either, and I most certainly do wear out tires. But modern hardware, alignments, and balances are much, much better than those from the 1960's. They wear evenly without rotating.
Don't focus too much on the model name. Someone somewhere makes that style. Or MB does and calls it something else. Notice how the one I linked has some of the features painted black, but @Gimber 's doesn't. For the manufacturer this probably means a different design name using the same press.
Here is Wisconsin the tire covers are more detrimental than leaving the tires exposed to the sun. All that junk getting stuck inside the cover in the winter is much worse than our sun.