C'mon, IFR aircraft do this all the time. The forecast says the forecast is below the minima but the local agent says the base is above a particular feature which indicates you'll get in off an instrument approach. You plan a suitable alternate or holding fuel according to the forecast. You arrive, shoot an approach and land or not depending on the conditions you encounter at the time.
What if the local agent says "it's way too low" and you decide not to go? You've based an operational decision on an unofficial source, but haven't planned, conducted or controlled a flight using that information.