Autumn sowing of Beans and Peas

Does anyone have any ideas on stopping short tongued bees robbing the nectar from my broad beans without pollinating them?
I could grow flowers they can get at easily, any ideas of good ones for nectar?
I could try hand pollinating but would be time consuming?
Would sowing now help? Or would they be one of the few flowering early spring and so bee more vulnerable.

I sometimes have to use a net against carpenter bees who bite through the base of the flowers. The problem has improved now there are other flowers for them to feed on- a good excuse for leaving the early dandelions!