Hello @anon29275264,
Thank you for sharing your experience!
I will share this with the team 
Cheers,
Matias
we have ~100 users and the lack of this feature is one of half a dozen reasons that we’re currently evaluating other alternatives to Monday… it’s impossible to integrate external systems to task boards without the ability to impersonate users
The answer is: Is NOT possible. There is no way to change the update creator using API calls