I have never had trouble removing my Boker clips, but I did have troble with Benchmades - until I learned their 'secret handshake'. It seems they use blue Loctite - which releases easily with heat. A 25/30 watt soldering pencil, held on the screw head for 5-10 seconds, will soften that threadlock considerably. Dunking the screw in acetone, once removed, will dissolve the threadlock remnants - making re-use easier. If the Torxx head screw is stripped to the point where the appropriately sized driver - with lots of downward pressure - won't remove it, try the next larger size. Good luck!
Stainz