I have quite a few rebloomers in my Northern Michigan (zone 5 ) garden but I dont know how they would perform there.
Going Banana's
Siloam Amazing Grace
Darla Anita
Golden Prize- not listed as rebloomer but always does for me
Allegheny Sunset
Broadway Review
Butterscotch Ruffles
Designer Jeans
Eenie Weenie
Janice Brown
Little Witching Hour
Mary Ethel Anderson
Panda Bear
This are just a few . Most generally these ones are consistent rebloomers for me.