Chris, you made me laugh! Sargent? Not a chance!
Anyone who comes to my house knows that they may become one of my "victims", it's usually my camera though. I never considered bribing them with food. I do like your idea though and will try it. I always seem to be able to find willing models, maybe a loaf of bread.
I am a notoriously slow painter; your exercise would be good for me.
Jean