I was taught that the knives should be done as a matched pair to avoid vibration and imbalance.A few moo
A few moons ago I used a grinder to rest the bevel and then sharpened individually, I did end up with knives of sufficiently different weight that it caused vibration. Using the approach of working them as a pair I have not had the same issue. The one thing that can happen with the jig is that the end of the knives gets more removed than the middle and you end up with a convex edge, if you are aware of this you can avoid it by hand position/pressure and regular checking that the edges are staying straight.
I’ve never attempted to do them myself as I don’t believe it’s safe, and if HSE were called I’d be in big trouble if an accident were caused because of this.
All you need is two pairs of knives, one on the machine and one at the sharpeners.
It costs around £12 to do a 260mm set, which isn’t much.
With modern PT you can’t even sharpen the blades yourself as they’re disposable.