Hi Tim,
I thought I would join in here since I am indeed one of those 'inquiring minds'
and I enjoy researching weapons -and- associated items which often bring in clues and perspective in studying the weapons. Over the years we have learned that expanding our horizons a bit is definitely productive in our studies.
It seems that in African weaponry, and material culture, processional and ceremonial items are extremely important, so I think you are on track with your observations on this stick. Interesting observations on the decoration also. The importance of 'magic' and superstition in West Africa, particularly in Vodun is of course well known (not suggesting the stick is associated at this point).
All the best,
Jim