i have done that for years with french type beans (borlotti), that have too far gone to use as flageolets.
no reason why it shouldn´t work with runners.
in the first year though, there were quite a few weevil-infested beans after a few months.
to avoid that, put your dry beans in the freezer for 4 days. if there are any bugs, they will perish. afterwards store them in jars with lids on.
it works perfectly for me.