Short answer, yes.
However, it's tricky and not without risks.
It's simple to remove the torsion bar, thus making it non-AO. The problem is that the torsion bar also aids blade retention when closed. Without it, only liner friction keeps the blade closed. Manual liner-locks solve this problem by creating a ball-detent. This is simply a small ball in the liner that sits in a hole in the blade. Kershaw liner locks already have the ball, (to reduce friction, I suppose), but not the hole in the blade (the Needs Work is an exception).
Drilling the hole is simple in theory, but difficult to get perfect. First, remember that blade steel is hardened. A steel drill bit will not work. Your best option is an expensive and brittle solid-carbide bit. You then must drill the hole precisely, or you will have a bit (or a lot) of wiggle when the blade is closed. This modification is permanent.
You also need to keep in mind that these were never designed as manual flippers. It's unlikely that you will have good manual flipper action. The flippers aren't usually long enough.
I did this mod with a Baby Boa, and I'm happy with the results. I now have a nice, little, manual folder. It doesn't flip without some wrist, though.
Phillip Dobson