To guarantee this you would probably need to behave in an extreme way, for example by urinating in front of the interviewer. The above would certainly guarantee you a refusal, but more subtly, one...
the standard translation of "would" in French is to use the "subjonctif" tense of the verb (which follows would in your phrase), or of the verb "vouloir"
she would buy something (if she could) =...
I would buy a beer and walk around till it goes away... simple solution but usually works for me... btw, for questions like "What Would You Do ..." take a look at this newly born website:...