You can remap individual applications' keyboard shortcuts in System Preferences > Keyboard settings. For this case, the keyboard shortcut should remap the menu item "Developer Toolbar". I like to remap CMD+Q to something harmless like "Hide Others" to avoid accidentally quitting apps. :)
alt-T W v
which looks a little unwieldy, except you don't have to move from the home keys, and I find it much easier to type than
hands up, look for fn, left middle to shift and left index to fn, right middle float up and over to f2
You can muscle memory a short menubar keyboard sequence pretty quickly if you use it enough.