Dual purpose Dwarf beans - green beans or dried or stock food

I am doing road-side sales in an area that has summer influxes of tourists, and so sales are very seasonal.  I don't want to plant climbing beans and have to pick hundreds of beans a day that won't sell just to keep the plant producing.  I was wondering about planting dwarf beans that if not picked green would could be left to harvest as a dried bean.  

The question is - how good are various dried beans as a young green bean - e.g. Cannellini, pinto, painted / borlotto.  Anyone out there with experience?

The other option would be to pick green beans specifically grown as green bean varieties, and if they don't sell, pull the whole plant and feed it to my livestock (pigs, goats, cattle).  
How safe is this to do in larger quantities?

For a few years now I've planted rattlesnake beans (like a pinto) that are great green and dried as well. And I also grow some normal pole beans that produce a dried white bean (probably cannellini type). I think pigs and goats could probably do pretty well with larger quantities of them, I know my rabbits are thrilled with the vines and the beans, not sure about cattle.