here in France, members of a french forum called LockPickingTeam (http://lockpickingteam.com/) have had an brainstorming session about repinning and how to make it as easy as possible.
and we invented one nice tool to repin really easily, it's called the repining core
it's basically a core which holes have been drilled from top to bottom to remove the profile cuts of the key.

the keyway has also been cut wider to allow easier use of picks to push the pins.

the bottom of the core has also been cut to have enough space to insert the paperclip or whatever else to maintain the pins.


this will works best with the core from the same brand of the lock you wanna repin.