Sure. Most fixed angle sharpeners work to some degree, I just recommended one that isn't sold by "Random Letter Chinese Shop" and that I have bought and know personally works.

In addition, for the moment, the stones used in the system I recommended are reliably decent and have been analyzed by a bunch of the YouTube knife nerds. The other fixed angle systems can be hit or miss with the stones.

If someone is sufficiently interested that they want to use the stones without the system, they've started down the path to being a knife nerd and have outgrown my recommendation.