I've thought about it a bit and I think that as long as all you're doing is REPLACING the subtitles with your own you could probably use the text tool of Premiere... I think that has the capability of matting the background of the text. Just make sure the area of your new subtitles overlays the old ones and I think it may work for you.
I've liked the look of Apples ever since their new lexan cases came out... darn they look incredible, too bad they're soo darn slow.
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