Weirded over completely.
Plaster ? I don't know about that. I usually epoxy pottery back together, it takes some patience, and you have to glue one fragment at a time usually. Plaster might work as filler after the repair.
We've got this legal secretary lady next door who fixes stuff for us, she used to repair artwork . She used dental wax to fill cracks with, it works great, but I don't know how to buy it, she just has some left from her old job.
PS. sorry to hear about your breakage. (My new Mantra), : "It's not that bad."
I started that today, I've said it at least 20 times;.....I think it's an improvement over, "Fuck it !".