There are a lot of constraints on your request, which is why I suspect you've had no responses. I had two ideas, neither of which is fantastic: You could try a pink flowering potentilla; they tend to like slightly more alkaline soil than your rhodies, but it could work. I don't know how it will look with those others, but you could see. Also, you try a heath, which would certainly like the location and soil, and will be beautifully pink in the early spring, but then it will be just green.

Patty

I live in zone 6 and I have Disco Belle Hibiscus that does well on the west side of my house. It gets about 2 to 2.5 feet high. I have them in the dark pink, pastel pink with dark eye and the white with dark pink eye. They die to the ground in the winter and come up every year to about 2-2.5 feet. I have heavy clay soil. If you didn't want pink, I would suggest bluebeard (blue flowers) or a dwarf mockorange or dwarf clethra (white flowers).

Thanks for the ideas. I think Hibiscus may be too dramatic for the site (though I do love them--and there is definitely a "Wow" factor when you see them in NJ!). I'm going look into a dwarf mock orange, cinquefoil or maybe even a day lily or knockout rose in blush.