If your self-esteem is sufficiently resilient, you can exploit the same human tendencies behind Cunningham's Law (the best way to get the right answer on the internet is not to ask a question; it's to post the wrong answer). Check your crappy end-to-end proof of concept into the team repository, and your teammates will be so horrified and outraged that they'll fix it faster than any sprint could have planned.

yeah there are ways, but is it good for your career lol

Also the one person who has to review it before checking in needs to be resilient too