Sunpatiens is the bomb
Of course we will need to do without Impatiens walleriana for the forseeable future.
Last year I planted just a few white "Sunpatiens" in place of walleriana...just as an experiment. The location would be considered shade aspect...say direct morning from only before 10 am. They did just fine.
This year I have some of the pink and again they are doing wonderfully in much less than full sun.