Easiest thing to do is drill and pin a hole right below the end of the tang when open, and have a kind of guard/shield/latch that comes up and keeps the tang from moving. Beyond that, the ideas are endless, but I do believe that should be simplest. That's the same idea as an Opinel, using a metal piece to block movement.
Also, I'd like some input from my PIF buddies. I just had some good fortune on the job hunt, and would like to gift myself because I've basically been penny pinching. I'd like your thoughts on what seems like the better buy.
On the list is a Military, Delica, Endura, Rat 2, Zancudo, and Ritter Grip (small or large). Anything else I like is kinda out of price range, and these really do it for me anyway. Too bad I can't get that Cuscadi PM2 lol.