No machine or jig will do what you are looking for.
I've found that once you develop the skill (muscle memory) to get a scary sharp edge, that it will remain with you even without frequent practice, just like riding a bicycle. The hard part is developing the skill, which can take several months.
You may want to look into getting a knife with a wide bevel (Heiji, Tanaka Ginsanko, Kagikiyo) that you can sharpen to what is improperly called a "zero grind" - just flatten the bevels so that an apex is formed. Since you are using the bevel itself as a guide, there is no problem holding a steady angle. The downside to this is that the resulting edge angle may be too acute to stand up to hard use.
Or, you can do what many straight razor users who don't care to learn how to hone do - buy two identical knives, and when one goes dull send it out to a professional like Jon Broida for sharpening while you use the second one.
Rick