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With USB sticks and SD cards the rule of thumb seems to be the smaller the better. Try and get hold of a 1GB USB stick and use that.
The fact that it sees the USB keyboard means that it should see the USB stick. The other thing is to use a plane simple USB stick and also be aware not all USB sticke are created equal - I seem to remember someone reported they tried several until they found one that worked.
You might have changed the button mapping if you rooted about in the system files but I'm not sure that the remapping would apply that early in the boot process - if it does then you are looking at applying JTAG and some very careful reprogramming.
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