Anyone know of a "backyard" method to put the temper back in an EZ-Out?

I'm at work, and we had to drill out a stripped and/or seized allen head set screw on a small(-ish) exhaust fan. When we applied some heat to the fan hub (which contained the remaining portion of the set screw and the EZ-Out), we must have overheated things a bit, as here's what we have now:

IMG_5498.JPG

The picture doesn't do justice to the bluish tint, but you get the idea.

Regardless, I know these are only a few bucks at the hardware store, but I'm curious if there is way to heat treat this at home ("DIY"). Or should we just toss this and replace it?

Thanks!

Jim

(We did get everything apart, and the Boys are in-back right now installing new bearings, and the fan assembly, on a new blower shaft.)