Can't help you with the stripped screw but here is a link to a recent thread on the LP8 strip down which may be of help.http://www.network54.com/Forum/184474/thread/1395088794/last-1398961923/LP+8+disassembly+photos
Which side are you trying to remove ? I remove the left hand side one but it shouldn't matter which one you do. If you can get all the other screws out, and can get either of the safety screws out you should be able to separate the 2 halves. The safety goes right through from side to side so it should come apart. If it doesn't work, let me know and I'll try it on mine. (I'm the one who put up those photos, they're here on this site too.)
Mark; how do you like that Model 9? I'm strangely drawn to that funny looking pistol. I doubt the LP8 trigger will ever be anything like the P1 or P3. They are amazing aren't they? Good luck with the return, tk