The N55 in my E92 335i just seized and I'm going to go down the LS3 path as well.
If you find any information on the canbus integration, please post here for everyone to read!
Not sure if you've stumbled on it, but www.lse90.com looks to be a good resource. I've read the build thread from the guy who runs the site and he mentions working towards selling wiring harness adapters for some systems.
Might be worth getting in contact with him and seeing what he has to say!
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