The original poster might want to do a bit of market research in their general area. What traits and colors are people interested in? Are they looking for a lot of eggs or looking for chickens that could be pets?Svart Hona and Ayam Cemani are both supposed to be all-black, single-comb chickens who lay light-colored eggs. I understand that there must be some differences, but they sure share some really obvious similarities! So it might not make sense to have both of them.
For every breed on your "maybe" list, I can think of excellent reasons to include it, so I really don't know what to suggest! The Lemon Cuckoo Niederrheiner look cool when I look them up, I've always liked the color of Silver Laced Wyandottes, Barnevelders are so pretty and lay dark eggs, Swedish Flower hens are neat for the variety of colors...
Melanistic black chickens are a trend now, and people who are into them might want both ACs and Svart Honas.
On the other hand, if people in the general area show more interest in something else, might want to go with another breed.
Check this page for some ideas!
https://www.dcheritagepoultry.com/rare-chickens.html