I manually created right now 5 accounts in the BAS browser, but then I got lazy to create more, and also lazy to write a script.
All the accounts have prepared browser profiles. Not a single account even asked for an SMS.
Yes, I know that this doesn't mean the accounts will be in good standing, only time will tell.
You should know that when any techniques are implemented with multiple threads, you might face other challenges, like Google knowing what you are running. And this task will require additional skills.
The process of creating one account is shown in screenshots:
spoiler