Hi Alfredo,
I make standard DVDs for the same customer that I make the Blu-rays. The bars on the side are quite small and I’ve never seen them as a problem, even on a 60″ flat screen. You could create a DV export, bring it back into Premiere and resize it by a few percentage point. Example size 104%. You will lose some from the top and bottom, but you will fill a widescreen. I would try it with a ten minute segment and see which you like better.
Good Luck,
John