Well I take care of a geranium that's indoors and it blooms and grows with only a couple hours of sunlight-- not even direct sunlight.... so they might do just fine for you.

do you have alyssum available there? comes in mostly white and purple flowers-- they can spread, are short and prefer filtered sun with a little bit of direct sun and they don't mind the heat.

How exciting! I hope you post again and let us know what you've chosen and how things go.

mandy