The best idea would to make CTRL+K make you pop a pill and die. Or type /pill to use it.
here's an item_Self Deletesword.
http://puu.sh/1LPO5
Could you replace the model with that of a small knife? Pulling out a a huge sword that for some reason can't be used in combat doesn't quite make sense, unless it happens to be machima/cinematics.
How about a Self Delete launcher? That would be awesome...
The already-made "Boom-Belt" that kills you and explodes is better and makes more sense, plus, most rocket launchers have a specified "arming distance", which causes the rocket to have to travel a minimum distance before it explodes on contact.
I still support a Self Delete launcher, but if you're looking for gameplay mechanics we already have it.