Ryou is basically the ability to extend Haki beyond the confines of the body. In this sense, if they are able to coat a sword with CoA, then they have Ryou. Some techniques that possibly follow the same principle are Kid's scrap arm, Katakuri's Chikara Mochi and Marco's flaming feathers.
Now it hasn't been well explained by Hypgoro whether the haki barrier is a variation of the basic Ryou or a second stage of the technique.