Well, if you don't meet you offers for either, and neither accept you, then you will be in clearing anyway. You wont need to wait to be 'released'.
I'd wait it out and see what happens on results day, whilst looking at clearing options that may interest you. If by some chance your firm or insurance accepted you, would you go? If so, just leave it be. But if you have completely changed your mind on course, ask to be rejected.