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It can't be done..
It's locked out and the software is not written to allow Sport+ on start up because of liability reasons; as S+ partially disables the stability control.
BMW wants you to acknowledge that traction is limited when you hit Sport+, so it will never be a default-on option, ever.
Same as when you program Sport+ into the M1 & M2 buttons on the M2C, the system still ask you to confirm that you're aware of limited stability every time you hit the button.
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