Long story short: Listen to Bill, convert the 44.1Khz files to 48KHz and when everything works, then we can all sit around navel gazing. I would have thought NLEs could do this seamlessly by now but they don't. Convert ALL audio to the frequency of your timeline. Yes, in 30 minutes there may be SOME drift but you will be close. Like 1 or 2 frames close, barring anything unforeseen.

Do it and then tell us how well it worked.