Interviews don't hurt people, people hurt people
There is absolutely nothing wrong with interviewing and turning down an offer or even having a backup job. However, if you had absolutely no intention of considering Flint Michigan, then of course, don't ask to be submitted there. But, if there's even the slightest chance that you would take it as a back up plan, interview for your second or third option. When your option tells you that they won't even consider block scheduling, or, they take 3 weeks to even call, that last option is now potentially a blessing in disguise.