1. Assign the new Key Maps to the appropriate Character Sets -- with either the new Key Map or the Character Set selected in the top pane, drag the other into the bottom left pane so that it appears under Key Maps for the Character Set, or under Character Sets for the Key Map.
2. Add Key Map State Actions to "Activate Maps" under the Control Key Map (called "Always On" for those not playing WoW) -- http://isboxer.com/wiki/FAQ#I_added_..._disable_it.3F
3. White List the appropriate Key Maps in each Character Set, so the wrong ones don't get loaded -- also explained in http://isboxer.com/wiki/FAQ#I_added_..._disable_it.3F