If you want clean power bite the bullet and run a couple new lines minimum. Short cuts just don't cut it on this issue.
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Well if your outlets are inverted you can switch the wires around. Also you may as well put in some new outlets, commercial ones are under 5 bucks each. It's easy to do it you can operate a screwdriver. Be sure to switch off the power first! You can get good power conditioners made by Oneac and Powervar off of Ebay for relatively cheap. You still won't have a ground but otherwise you should be ok.