Well, the Mirage apparently has electric assisted steering, so that mod is a simple fuse removal.
(Or switch with a high-current relay circuit).
And even without engine-off stuff, I still feel the manual will kick urban butt vs. the CVT: neutral coasting (engine-on), short shifting into top gear cruising, and deceleration fuel cut-off rather than light braking do wonders for economy. All things you may not be able to do easily or at all with the CVT. Even high load/low RPM pulse & engine-on gliding to the next transition is something you can easily do with a manual.