At the risk of being Seen as a know-it-all. Have a Look at the Steering column of a Classic porsche 911, the zenit of German over engineering. Splines with no taper, and a c-clip as end Stop for the hub. 140 USD for a hub Adapter ist ridiculous.
I am too lazy to calculate transmittable torque for a 30x16x36T but it is a lot for mild steel. I am more concerend about the strength of the die-cast material of the hub.