There's an outfit called "Museum Replicas" which sells what they describe as being "fully functional" reproductions of antique edged weapons, including spear points/blades. You might find something more well-suited for your purposes there. IIRC, they do not sell or provide the wooden shafts for their spears, but include dimensional/fitting data and materials recommendations to help you find a suitable piece locally.
I purchased several repro swords and a few daggers, etc. from them over the years, but that was back before the company was purchased from Hank Reinhardt by an Indian outfit called "Windlass Steelcrafts" several years back. While I was uniformly very favorably impressed with the quality of the materials and workmanship displayed in the items I purchased from them back then, I can't say whether the current owners have held to the same standards or not.