Leggy Pole Bean question

I always start my Quintus Pole Beans inside and have very good results. This year is turning out to be really unusual- we had record snow, now are having a cloudy, windy spell. My bean seedlings are looking good, but are about 6-8" tall in their soil- in my greenhouse. My question is: how will they respond to planting out deep in the soil?- I dug trenches to try to warm the soil, but with no sun it isn't helping! Will roots form on stems like tomatoes do? Can I lay them down on the sides ? Or am I going to have to sow another batch? I have plenty of saved seeds. I'll appreciate any help--thanks- Jo in TriCities WA