I'm not 100% sure about your situation, but if you can download a stock zip to your sd card and can boot into recovery, I see no reason why you shouldn't be able to get to stock without a computer. Unfortunately I have no link to a stock zip, but finding one should only be a google search away. Of course this will not work if you cannot boot into recovery and wipe and install a zip from sd. Also, to truly get back to stock, you will need to unroot, which is not something I would ever want to do unless I had to return my phone. I'm not sure why you need to get back to stock. If I were you, I would flash liberty 1.5 and enjoy a phone almost uncontaminated by motorola (almost cus the bastards still have our bootloader locked). Good luck and I would love a link to the stock zip if you find one
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