I highly recommend the Spyderco TriAngle Sharpmaker https://www.spyderco.com/catalog/details.php?product=77
It is not a "system" as much as a free hand approach but it works very nicely with such a small learning curve.
Nearly every knife that already has a decent edge can be sharpened to a very keen edge with the basic set up
of the two ceramic rod sets - a medium grit brown and a fine grit white. For knife edges that need some repair
or for those you might want to establish a new bevel you would also want to get a set of diamond rods to augment the
basic set up. Our knives and scissors are very sharp at all times using the Spyderco. It sits on my bench, takes up little room,
virtually no set up and few minutes to bring a good edge to very sharp. I don't carry a dull knife and I always carry a knife.