I think you're going to be fine. Like you, I have a GPA under the median for the programs I'm targeting. The leverage we both have is a long stretch of work experience. If you can show a pattern of success at work, which signals a change in work ethic or perspective from your undergrad days, then you're in the best shape you can be.
It's a little late now to build up an alternative transcript, but if things don't go well for you, that's one route to pursue. Ultimately, part-time programs are not as competitive as the full-time programs, so I think your GMAT is already excellent for your goals. Agree that you should focus on the rest of your application.
Best of luck!
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