A group of users at web site EDCForums have tweaked their Leatherman (and Leatherman-like) multi-tools into the ultimate multi-key tools. The process appears to involve grinding the edges off your regular keys then bolting them in place of a few or all of the regular tools (you can mix and match keys and screwdrivers if you like, for example). If you liked our previously posted DIY compact keychain but wanted a little more robust key holder, the variety of user-contributed multi-key ideas at EDCForums are worth a look. It's like a Keyport, only way less expensive and arguably more useful. Thanks Edney!
The REAL Leatherman KEYman! My custom LM Multi-Key!! [EDCForums]