how would a script wait for my cocoabo-type familiar to steal meat before killing the monster? (use spices until it notices that cocoabo has stolen meat.)
That would be really tough, unless you used zarqon's consult script. He's already solved the problem. It uses spices, turtle totem, facsimile dictionary, specter scepter, whatever to keep from killing the monster. Then it will allow you to kill the monster the round after your cocoabo (or stocking, npzr, hobo monkey, etc) steals meat. Or once turn 10 arrives the cocoabo won't steal meat anymore, so it will try to kill the monster.
As a bonus, zarqon's script will handle insulting pirates, stealing tools from gremlins and bunches of other things.