To route into the engine bay tie a nut or similar to some string and drop it down into the footwell via the electronics box. Tape the wire to it and pull back through.
All sorted, thanks everyone for your help! Just went out for a run and cruise is working. Not sure why BMW made the stalk work differently from every other cruise stalk out there, but I figured it out :driving:
Btw, I found this image on google's cache which helped a lot when finding the right wire to connect to in the ECU box:
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