I just went through this yesterday for AP because I hadn't gotten around to it for some reason. Happy to help if I can.
The way this works is, you go to the Controls options and create a new profile, I call mine "Accessibility," for obvious reasons. You can set it as your default in new games. One OCR trick I've found is that sometimes the only option which is not announced by NVDA is the one which is actually selected, this probably has to do with the color highlighting.
Anyway. AFter you copy/create your new profile go right three places, to Interface. Go down all the way to the bottom, the menu doesn't loop. Hit enter on any hotkey and you'll get a list of four options, "Add control," "remove control," "apply," or "cancel." THe names might be slightly different, I'm typing this from memory, but the effect should be the same. You should also be able to see which key you're on. the one you want to add is for the trade log hotkey. I used F6.
Basically hit ENter on "add," and then press F6, the game should make the usual confirmation sound and OCR shouldn't mention any conflicting keys. Go down to APply, and hit enter.
After all that, you can save your profile, which is in the far left menu of options.
Hope this helps. I'm happy to try and walk you through it on SKype if that would be easier.