Hacking Stretching DS VC games to fit the screen, ignoring aspect ratio.

[SableSugar]

I'm using a 4:3 CRT and I'd like to play through Phantom Hourglass and Spirit Tracks with the bottom screen on the TV, but in 4:3 mode there's both letterboxing and pillarboxing, and in 16:9 mode there's squishing and pillarboxing. Ideally, I'd like to play in 16:9 mode with the output stretched to fill to screen, therefore using the proper aspect ratio on a 4:3 TV.

I know it's possible to edit the JSON file for DS VC games to increase their internal resolution, etc. so would it be possible to do this as well?