Elimination of the SKREEM is not an easy task, but Josh Chase at his "Mercedes Swap Shop" can help. The fix involves you sending him your SKREEM, ECU and Key.
When the items come back to you, the ECU is no longer asking the SKREEM for startup permission, but you still need the SKREEM, as that is your receiver for the keyfob's lock and unlock buttons.

Contact Josh directly at:
https://themercedesswapshop.com/