

You might consider a aluminum heat bed with a regular piece of glass on top. Look up heat beds on reprap and see how the diy community does it. They are cheap and easily replaced. I just print on the aluminum with painters tape. Sorry that it fractured like that, it happens. So having the glass glued down is not a good plan.
It might come loose if you heat the heat bed. At least soften enough to pry it off. The other option would be to finish breaking the glass. Then you could use acetone, or something to remove the glue.