I don't understand the big thing about 6 bolt hubs, but any machinist could make one for the BME 110.....Get a piece of 2024 or 7075 aluminum, bore it to fit the crank, countersink it for a custom 8mm stud to hold it on, and put 6 threaded holes in it for the prop...Install with green 680 Loctite...Thread the smooth end of the custom stud 10-32 for a spinner bolt...
The stud would start out at 1/2 inch diameter, threaded 8 mm on one end, ground taper to fit the countersink in the hub, and smooth 8mm diameter to fit through the prop...
No knurling needed on the hub, six bolts keep the prop from turning...The bottom of the hub would be small enough to hold the ring with the sensor magnet in it....