Flek,
Trumpet vines can grow down as well as climb. My hummies seem to like having the ability to fly thru an area. It should work if the surrounding area where the planter will be located is a fly thru area. I would also plant some red salvia, red cardinal flower, red bee balm or red coral bells in a planter below it to attract them while the hanging basket is getting established. Good Luck

That large of a containter once it is planted and watered thoroughly is going to weight a ton! I sure hope you have strong enough supports on your patio to hold it or it may just bring whatever is holding it up down to the ground. Now that said here are a couple of suggestions: trailing asarina, trailing nasturtiums and maybe wild morning glory will trail although it prefers to climb. If it was me, I would put that large container on the ground with a trellis and put climbers like cypress vine, cardinal climber, and the native morning glory. You should also consider coral honeysuckle vine which is a perennial native.

Penny