They ended up doing as the Servitor suggested, but the plan enacted had an extra orky flare to it.An explosive charge, as suggested by the cyborg, was replaced with something a little harder, and the traditional trigger was replaced with one that was a little more crude, but very reliable.
A shell, a medium sized one, was teleported to the bridge, accompanied by a single gretchin with a thunder hammer. As soon as the two materialized, it was a race to the finish. The imperials going for their weapons to kill it, the gretchin trying to take as many people with him as possible before his inevitable death.
The grot won.