canopy breaking tool?

Greetings,

I've been looking for a canopy breaking tool, that would work on a 1/4"
thick canopy. I know the military has had a few of these over the years,
but I haven't been able to locate a used, or surplus tool. I'm betting that
someone makes a tool for this, but I sure can't find one in any internet
search.

For the record, I've seen the life hammers, and such that are made for
tempered auto glass, but I don't think those would work. If anyone can
point me to a tool that's made for aircraft canopies, I'd certainly
appreciate it.

Cheers,
Rusty