If you genuinely want professional you want one of these
Shears Logic
www.shearslogic.com
Or
OverviewWhen you want to provide the absolute best edge possible on high end convex shears, look no further than the Wolff Industries Hira-To® Scissors Sharpening System. The Hira-To® is designed to sharpen and convex beauty, barber, and grooming scissors. It is easier, faster, and more precise...
wolffindustries.com
I own the katoku flat hone and several other flat hones with convexing arm and without. I really like the katoku. It’s a top tier machine.
I sharpen grooming and barber shears semi-professionally (kind of a side hobby job).
I also have a WE 130 and Tormek T-8. I have considered fitting the T-8 with a twice as sharp arm and convexing system but honestly neither are the way to go if you want “professional” or semi professional.
I will say this though… if you don’t want to layout the that much money you could build your own powered 6” flat hone ($300-500) and free hand sharpen on it. I built a couple when I started and they are super adequate. I can do everything I need on both of my backup machines. I just like the fit finish of the professional machine.I would still choose my home built 6” flat hone over WE, tormek or twice as sharp. The twice as sharp with convexing clamp might get a second look but probably not…
Watch a few videos on ytube and those convexing machine and you’ll get the idea.