Terminator layout with command that survives sigkill?

Terminator allows custom layouts with a command such as bash -lc 'npm start'; bash However, triggering SIGKILL (CONTROL-C) will kill part of the terminal and mess up your layout. SIGQUIT works but that's hard to remember. Is there a way to have a layout with a bash command that drops into a bash interactive terminal after SIGKILL, instead of having to use SIGQUIT?