I wouldn't use a "cheapo" stone for _anything_ involving a straight razor.
Wet-or-dry sandpaper (400 or 1000 grit) works fine to set bevels.
One note:
. . . If you're using a honing motion (edge leading), either glue the sandpaper
firmly down to the base, or only tape down the edge closest to you, and put a thin film of water underneath the paper (or film).
If you tape down two edges (near and far), you may get a bubble if the paper stretches, and that will change your honing angle (or wreck the edge completely).
. Charles