Follow your MEL guidance step by step.
Tell your colleague that if he wants to change such procedure,he should first meet with your chief pilot,tech pilots,engineers and at last but not least Boeing.
If his "idea" is any good,Perf and Sops will be changed,he will then legally be able to do so.
If some doesnt look right,bring it to light to your managers,in the meanwhile follow given guidance,most of the time those who write have done the research behind.
In case of emergency,he can deviate.
Safe flights.