Unless you’re an expert user I would not let any power sharpener anywhere near a pocket knife. I learned free-hand sharpening (using stones) many years ago, but nowadays nobody seems to want to learn a skill that takes practice. (Unless it’s a video game).
About three years ago I discovered the Worksharp Guided Sharpening System, which uses diamond plates with angle guides on each end. As far as I’m concerned it’s the best of all worlds. The interchangeable guides are there (comes with different angles that are interchangeable) if you want them, but are removable if you just want to freehand sharpen. No clamps!! The diamond plates remove material much faster than conventional stones, so some caution is advisable if you’re a veteran stones sharpener, until you get used to the diamonds. It also comes with a ceramic rod - similar to a sharpening steel it is great for touching up and straightening your blade edge, without metal removal. Also useful for serrated edges.
(BTW I have a Ken Onion model Worksharp power sharpener, a gift from our oldest son. After trying it extensively and finding he did not like it, he gave it to me. I tried it on a couple of junker knives. It’s now in my shop - works great on mower blades IMHO).
Ken