Can the starches in beans be converted......?
Are you suggesting that the OP put Beano in his wort?
It has been done. People use Beano to make 'light' beer. I have used it to try to dry out an extract RIS that was nasty sweet and ended up with bottle bombs (Well one bottle bomb).
Oscar, Yes the starches in beans can be converted. either via beano if you are going to eat them. or, if one was so inclined, via diastatic malt in a mash. (you would have to cook them first). Bean beer. mmmm.