Spring Heater Box Cleaning - Damage Found

So we finally got decent weather enough to clear some room in my garage and start some projects, first of which is a heater core replacement and heater box cleanup and rebuild using gasket and foam kit from Detroit Muscle Technologies.

On pulling the box, I found it to be fairly fragile, but got it apart cleanly by being nice and careful. Unfortunately, when I pulled he hoses off, I found a break on the hose attachment.

What opinions do you all have on the best easy repair on the hose attachment that will keep the damage from spreading and hold up under the light pressure of a hose clamp. I've never fiberglassed before and thought that the curvature might make it tough as a first time attempt. JB Weld is my main idea, with basically sleeving it either inside or around the attachment with a chunk of PVC pipe as a secondary potential method.

Thanks!

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