Seems as though it's one thing after another. After getting the 245 back on the road from a long stay in the repair bay, the M47 has developed a noise. The symptoms very closely match those described in this thread:

https://www.brickboard.com/RWD/index.htm?id=633433&show_all=1

When in gear with the clutch pedal out (not depressed) I can hear a clickety-clack sound. I was going to describe it as a helicopter sound, but clickety-clack/sewing machine might be more apt. I can hear it in all gears, loudest in the lower gears. The sound disappears almost immediately when I press in the clutch pedal regardless of gear. I hear it as well with the car in neutral, idling, standing still or coasting. The sound only goes away when I depress the clutch pedal.

Is this a case of a simple fix, a bearing kit? The clutch was replaced approximately 100,000 miles ago. I have a 1200 mile round trip that is imminent, and don't have time to address this beforehand. Is this folly?