Can I recommend ignoring the fact that keypad is.. well keypad and treat it as additional X keys to bind?
I have binds that directly open browser, Emacs, terminal and even IM so that I don't have to use mouse. Some are more macroable, e.g. I had a job where I had to retype things from images (imagine the cost effectiveness), but because I'm lazy type I made a macro under a key that would screenshot -> OCR, key next to it was opening target app.