Windows NLE for *stretching* Anamorphic AVCHD 2.0?

[ddueck]

I've got an NEX7 with a Sankor 16-D 2x. Nice combo, and squeezing the footage to 1920x540 is easy in post through almost all the NLEs I use (Avid Studio, Premiere Elements). But if I want to *stretch* the footage, it gets trickier. These consumer NLEs, as nice as they can be, don't really allow custom project resolutions/ARs beyond 1080/16:9.

I tried using Lightworks, but it doesn't yet natively support AVCHD so I'd have to entirely transcode the footage. If I wanted to do that I'd just transcode AND resize all at once, and edit the new clips in one of my simpler NLEs. What I'm looking for is a Windows NLE that will let me resize/stretch my footage to 3840x1080 [i]within[/i] the project and export/master in that format as well. I'm guessing Premiere Pro is probably the best way to go here, but I can't afford it yet and I was naively wondering if there's a less expensive solution.  :P Any ideas?