I don’t know how commercial green beans would turn out. Home-grown ones have a great flavor. I’ve also tossed them with a little olive oil and garlic salt, spread them out on a baking sheet and baked until crispy. (One person can wipe out the whole tray, so I suggest you make two haha!)
You are probably right, that the quality of the grocery store green beans may not be as good as the home grown, but in the interest of learning the process, I may still try it. LOVE your idea about the olive oiled beans in garlic on baking sheet! Gonna have to try that!