I think there is a difference of stress. You stress the second syllable when you pronunce except but you stress the first syllable when you pronunce accept.
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accept or exc
I would say ACCEPT starts with a reduced vowel that is lower (on the IPA chart) than the vowel in EXCEPT.I would say that, too. And, Amy's example notwithstanding, except is so seldom used as a verb that I don't think there's much difficulty disambiguating the two in most contexts.