Back in the 1990s I crossed the above two species, Nerine rosea and Nerine fothergilla 'Major', getting a few seedlings which were sadly neglected in a small pot of many years, though a single flower stem arose in 2005 producing a flower the size and shape of N. rosea but an orangey colour. The bulbs were liberated into the garden 2 years ago and a second stem has arisen 13 years after the first!
Probably won't make my fortune with this one but as it's hardy in our garden I'll keep growing it and keep repeating the cross and crossing the three with other nerines to hopefully increase the range of hybrids.
I believe a similar range were raised in NZ years ago but not sure of their provenance,
cheers
fermi