20" long remote plastic breaker handle lever
There is no such device for that type of breaker. It is DESIGNED to be mounted into what's called a "dead front" panel in which only the handle sticks through. That would have prevented the collateral damage in the event of an arc flash due to breaker failure. Someone has built something with a breaker that was not intended to be used in that manner, so there is no support for off-book usage.

PROPERLY designed Arc Flash protection suits will prevent injury in an arc flash event taking place with doors open, a "40cal" suit and gloves would likely be more than adequate for the level of incident energy that can be associated with that series of breaker (10kAIC). But a "plastic handle" would not really protect anyone unless it was long enough to put them outside of the Blast Radius which I think would be 48" (I'm not going to look it up for you...)

There are different designs of Molded case Circuit Breakers that can be used and operated with the doors completely closed and have an external operating handle. You may want to rethink what you are using this for in that respect.