So I got my lighted master from the dealership the other day. I also got my aftermarket fob/blank. I noticed in the fob blank there is a spot for the EWS chip, it actually had an EWS chip in it, that won't work, obviously.
I tried to disassemble the factory key to swap the blade/chip into the new housing. Let me tell you, bad idea. Those keys are pretty much impossible to get ooen without hacking the whole thing apart. I stopped once the casing started to crack. I had gone around with an exscto nice, tried to pry it open after, put it in a vice to try to pop it open, no dice. The furthest I got was the back half where the light module is, that's when/where the edge of the casing started to crack. I called it quits then and snapped it back together. If you knew exactly where the chip was to avoid cutting it, you could probably cut it open of you knew for a fact you could put it in a donor case. I just cut the blade off the aftermarket fob and will just use them as two pieces.

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2006 X5 3.0i
2000 323i R.I.P.