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Ask Kevin at Integral Audio if he can sell you a harness or contact https://technicpnp.com, he should be able to sell you a BMW one. Someone on here wired up his own solution and did some wire rearranging.
Options are to buy a modified harness that bypasses it physically or to get it coded out yourself or by a 3rd party coder. Dealers CANNOT code this out, even if they wanted to.
I got a cable for like $30 from ebay and coded it out in maybe 10-15 minutes. Why bother with a delete harness if you can have coding capabilities at that price.