Anyone?

Guess not!

But I will add that I think there are wild Hippeastrums that would survive a zone 6 winter. Some of the ones from southern Argentina should work. Around here (zone 7) almost all of them are reliable to overwinter. It is also common to see hybrids with Crinum and Hippeastrum and whatever the Aztec lily is.

Yes the amaryllis 'Hardy Red', a very old hybrid, is legendarily cold hardy to at least 7 and reports of zone 5 with very heavy mulching. It is also a fast clumper. Like all amaryllis good drainage is crucial. I have young vigorous bulbs of 'Hardy Red' to trade for Lycoris Sprengerii, Chinensis, Longituba, Albiflora, or Incarnata.
Bill ewohryn@yahoo.com

There was a report of hybrids produced by crossing a Lycoris and Hippeastrum, in both directions. The breeder claimed that he used Lycoris aurea, but that is doubtful because the plant he used was hardy in Ohio. L. aurea is one of the more tender Lycoris species. It is more likely that one of the hardy yellow species was used: L. chinensis or L. traubii.

Karl

Here is a link that might be useful: Hippecoris Garfieldii