I picked that particular clip because 1) it looked like it matched the profile of the scales, and 2) the two-screw design is open on the part of the scale where one of the pins comes through. I've carried it every day for years now without trouble, it is a very durable clip and I couldn't be more pleased with it.
I did two of these. The first one I drilled and tapped the holes as best I could without drilling the pins out and disassembling the knife. I locked-tighted the screws in and have not had any trouble with that clip, except for the nagging doubt in my head. As you know, there is not much screw/thread involved there, and that one always bothered me.
So the second one I added the clip to, I drove out the pins and disassembled it, then just took the slab and drilled and tapped it. The drilling and tapping was so much easier to do with the knife disassembled. Then I reassembled and pinned it back together, and then set the screws in the clip last since there is the one pin under the clip. This worked really well and I got the screws nicely secured by doing it this way.
If you disassemble it, when you reset the pins really take care when you're peening the heads down. When I got close, I literally had to go one strike and check for tightness. As soon as it gets snug to open, stop or you'll have it too tight to open. I'd say that is the most critical part of the whole mod is resetting the pins properly. Also, these SAK pins are metric. I think you need two sizes, 2.5mm and 3mm. I went with the nickel silver ones from Jantz, it was the only place I could find the metric.
ETA: You got a tap Chiral? I can't remember if those were $$ but if they are shoot me a PM and I'll send you mine.