You may want to check the other roses by the knockout breeder, Radler. here is a link:
http://www.helpmefind.com/gard...
He is from Wisconsin so he breeds cold hardy roses.
Bubble Double is light pink
http://www.helpmefind.com/rose...
I grow one of his roses, Carefree Celebration, a coral rose. I wish that the stores would carry more of his roses, but they seem to focus on the single red and hot pink ones. Maybe there is a different marketing agreement for those.
David Austin has some very nice pink roses. Wildeve and Abraham Darby are two that I grow. Wildeve is one of my favorites. It is a soft, slightly warm pink.
Buck roses and many Kordes roses also do well in cold climates.
I grow Kordes Baby Blanket. It is the color you are looking for, but its form is different from the knockouts. I am still trying to figure out how to train it. I think it would be nice covering an arbor, but I don't have one. I have seen it sold as a standard. It would make a lovely weeping standard for those of you in warm climates.
