If you heat it enough to silver-braze, it will wind up dead-soft annealed.
If that isn't OK, then you might consider that the shear strength of
industrial-grade epoxies run upwards of 5,000 psi. It might do the job.

--
Ed Huntress

Now, there's an idea. Any particular product?

I could reinforce it a bit with a custom key that is only 0.025" high into
the pulley.