100% you have a chance. Not sure if you're a contextual student, but either way, interviews are usually the make or break factor (apart from when applicants have truly insane test scores, and even then they still are hugely important). If your interview performance is strong, that can definitely override a slightly lower BMAT.
Massive congrats on getting an interview; now just ensure you revise y12 material solidly + practice interview technique. Fingers crossed for you, I'm sure you'll smash it!