I'd go with Mike's fix as well. We used to do the same thing collage only we used MEK (methylethylkeytone). Acetone is likely less (not much) toxic.Boat places are a good source of west system components.
For your particular repair, I like mike's approach as it can remelt the plastic into one piece instead of cracked pieces, joints and filler. I use to do something similar with Methyl Methacrylate and ABS. It would soften the base plastic and once the MMA flashed off the joint would be as good as the base. Buying MMA is much harder than buying Acetone so I would use Mikes guide..