You are correct,, in that unless you want a scope or a red dot,, few GOOD systems are available for the Blackhawks. As I've aged,, and my eyes are not as clear & sharp as they once were,, I've had to look at red dots & scopes as another tool that can allow me accurate shooting. But I truly appreciate the simplicity & ease of open sights, and know we are somewhat limited there.
With the new rear blade replacements,, as well as Fermin's front sight options,, we are entering a new era of EXCELLENT open sight choices to be able to get to adjust a gun's sight system to our own specific eyes.
Fermin just added his website link in another thread, in the "Revolvers" section, in a post about RW grip frames & new sights. Those rear sights are available there too!
Look closely at the excellent pictures above. tons of serious thought & work went into designing & building these new rear sight blade replacements. Currently 10 options,, which,, is the largest new open sight options I've ever seen. As noted,, you can have a few different ones for different conditions.