I put some time into this, so I figured why not share with other Push owners wanting to use it with MIDI2LR. Obviously this is written for my own workflow, with many of the buttons being mapped to specific presets, but the knob functionality should be the same on any system, or at the very least a good jumping off point for creating your own. If you view the .xml files in a text editor I've created notes and a way of visually organizing it in order of how it's laid out on the Push. The mode select buttons work but the previous/next profile buttons aren't working at the moment for some reason. All the same, hope this helps anyone who has the Push and was wondering if you can connect it to Lightroom. You can!
Last bit of advice, buttons should be set to "absolute" and knobs should be set to "two's complement".
Cheers,
Ernie