Using 6061 3/8" thick aluminum to hold the front sprocket on a bicycle.

A 1/2 inch square hole through 3/8 inch thick aluminum fits over the
bottom bracket square tapered spindle. The spindle has rounded corners,
so it's not the ideal grip. But the flatbar will be pressed onto it
using a hard bolt.

Will 3/8 inch thick aluminum flatbar fit snugly onto a bicycle bottom
bracket square tapered spindle survive the torque?

Thanks.

I'm probably going to find out. Currently, it's the least difficult way I
know of to attach a custom sprocket to a bicycle bottom bracket.