Turns out, I was right.
I would harbor a guess that the DX2 (new and old) use the same regulator inside. However, I have not tested those and the innards may be a little different. Check your parts, and make sure your soldering it in the right way. Best case, it doesn't work. Worse case, you release the factory-packaged smoke and you get to buy a new radio. Not fun.
The mod is about as easy as it can get: De-solder a component, tin the pads, put the other component on. Done.
Here's a picture-by-picture diagram on what to do. As with everything on the Internet: I take no responsibility on your actions. This worked for me. It may not for you. Don't do it if you can't solder.
Step 1: Assemble your tools
Needle Nose Pliers
Solder, sponge, etc.