I would have used Mutabilis as a screen. It gets large but it's shape takes to trimming better. The Lady Banks that I've seen had arching branches and it only blooms in the spring. I have a 4 year old Monsieur Tillier that's easily that big and full of blooms continuously.

Can't help you with the bean but if that doesn't work out consider a clematis.

shebear, I looked up the Mutabilis & the pictures were beautiful. Do you have to do any spraying to keep the plant healthy? I may move the Lady Banks and give this a try...

I have one that is 4 years old and went from a very small gallon size to it's present 5ftx5ft without any spraying. Have never had a problem with black spot, mildew or rust. Very tough. Have never tried to prune it into any shape as it is on the back edge of my rose garden. Stays covered with blooms from early spring to frost.
Patsy

I have hyacinth bean vine on a trellis. It comes back from seed every year all on its own. I think it is probably best to plant it from seed after the soil has warmed up alittle. And I recall soaking the seeds when I was trying to get it started, but not sure it was necessary considering how many babies I have to pull up each year now.

It seems to be a slow starter - it doesn't really grow aggressively until late summer. Then look out - it will take over your 4x4 post and reach for anything it can to climb on. Mine crawled over into the neighbors backyard, into their crepe myrtle tree.
It doesn't bloom until fall, but worth the wait. I love the purple 'sweet pea'-type blossoms. Good luck