As a temporary deal...they do make USB keypads that aren't super pricey. I had one at one point...because the one game I still really like is mostly key controlled. Kind of a sad reason. ;-) But it was a lot easier than carrying around a full keyboard if I wanted that numeric keypad.
Thing is...They bought me the Crackberry I didn't want, and more importantly don't use...but by golly, I have to keep it with me...
So, there's that.