Small Flower suggestion:
Enchanter's Spell is an older small flower than can be bought for $5.
Enchanter's Spell 1982 Hudson 3" bloom is listed as rust resistant. I would like to have it but it has not been on any of the sellers lists that I have purchased plants from. I do have 8 children from it since it has made 28 daylilies. I would also like to have Little Witching Hour which is also a child plant of Enchanter's spell but have not ordered from anyone who sells it.
If you look at the child plants from Enchanter's Spell you see lots of variety. I am not sure if it takes the characteristics from the other parent or there is something in the genetics that created various colors and eyes. Anyhow it is a suggestion of one to try.