I prefer tip up carry. I use Emerson knives almost exclusively, and their Wave opening feature will only work with tip up carry. As far as the knife opening in the pocket, I don't see how this can happen if it is carried in the outside corner of the front pocket as the blade is trapped between the knife and the edge of the pocket therefore keeps it closed.
As far as your favorite AFCK being tip down only, you can remedy this. I own a BM CQC7, and it came tip down only. I work at a place with a machine shop, and using the pocket clip as a pattern, myself and our machinist drilled and tapped the other end of the handle for the screws. If I remember correctly, the tap we used was #2-56. Discountknives.com sells extra BM clips and screws for $5 a set. That's one of the advantages of G-10, although it will work for aluminum handles too.
If you notice, the latest BMs come tip up[940, 710] and the 720 provides a choice.
------------------
Brigadier
Beretta 92 FS nut and Wave-aholic
"And for this cause God shall send them stong delusion,that they should believe a lie;" 2 Thessalonians 2:11