You can try Sunpatiens these are found at HomeDepot or Fanfare at selected garden centers. Both are NG types and do really well in full sun, at least for me they did.

I've had fairly good luck growing any impatiens in the sun as long as you water the heck out of them. I grow the blitz imps that grow taller and have a larger flower in close to full sun in some areas. I've found if I water them they do famously.

tom8olvr, all I can say about your pictures is "WOWSA" Thanks, Stan

I've always gardened in the sun - we moved 3 years ago and
now I'm limited to shade lovers. I met some neighbors a few
weeks ago and introduced myself... I was walking the dogs-
then all of a sudden they said "OH, your the impatien
house!!!"

Yup, that's me! :)