Wow
I'm sure glad I looked at the pics.
If you God another fan same diameter cut the shaft same diameter of yours. Add a washer to the front and the back it probably would work.
The hoover fan linked has more blades but the depth is probably the same on the blades.
Jb weld the shaft on.
Most the 4 5 6 blade fans were on motors in the 30's-50's.
Les