MED: Earlier-blooming white SDB?

I have a hand-me-down purple self (slightly lighter beard) SDB that I think is "Banbury Ruffles", but I could be wrong. Whatever it is, it loves my zone 6b garden, thriving and blooming in sun, part shade, good soil and bad. I've divided it and moved it to places I never expected it to bloom, and it did, so now it's everywhere.
That's nice, but I wanted a little contrast, so I bought a few lighter-colored SDBs. "Baby Blessed" and "Favorite Angel" have done well for me and look good. Unfortunately, "Baby Blessed" starts to bloom just as the purple is finishing. "Favorite Angel" doesn't start until my IBs have begun to bloom -- it barely overlaps with "Baby Blessed". In fact, my last two SDB flowers, both "Favorite Angel", only closed yesterday, and my TBs have already started.
Does anyone list the relative bloom-times of median iris? Most catalogs I've seen are specific about when TBs bloom, but when it comes to medians, they just remind the reader of the general order: MDB, SDB, IB. How can I find an SDB, preferably in white or purple plicata on white, that blooms with my early purple? 

Thanks,
Dawn

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