That is a tough problem. If you just need a 16×9 show, try this.
Don’t use an HD template. Open AE and use
the NTSC DV or D1 widescreen template, depending
on if your footage is DV (720×480) or (720×486)
Use scale and enter 133% that will fill up
the 16×9 format. You can adjust your footage up and down as needed.
Then you can use this rendered file in a DVD project.
Just make sure you set your DVD setttings for 16×9 widescreen.
Good Luck