Barbara.. Good things happen when you mix Keppel's and Blyth's together normally good growing plants in a mix of colors
I say go for it most of my Seedlings from Haunted Heart are from using it as a pollen parent it is very fertile that way and you will get seedlings with lines on the falls from it.
Richard.. You will have fun making the crosses and watching them grow nothing like the surprise of them blooming for the 1st time.