Is it possible to use alt codes for special characters on a Macbook Pro running Windows? I've tried alt and the numbers, I've tried fn-alt, I've tried guessing where a fn keypad might lay (7-9, u-o, j-l, m) but no luck. Any ideas?
Any keyboard remapping tool should work for you. Here are some I found:
sharpkeys (this one may look more "respectable" since it is open source)
Here I found a review on these tools and others: the ultimate guide to keyboard remapping