Structure should be made plumb before stiffners are put in. Also, if structure was never designed, will it be stiff enough for wind or seismic loads, even if columns are made continuous using option 1. Column and beam strengthening may be required.
You may ask one of these charitable organizations to send an engineer to look and recommend. Although they don't do this kind of stuff, but they may be able to help. Contact and see.
Architecture for Humanity
Engineering Ministeries International
ASCE Disaster Assistance Volunteer Program...
"Crack control is a serviceability concern. The amount of crack control reinforcement required depends on the in service environment of the building element."
Isn't serviceability more of a concern with retaining wall since crack at the back of retaining wall will allow water to penetrate...
I am designing a retaining wall and wondering whether I should apply the crack control section 10.6.4 of ACI318? Although it says for "beams and slabs", shouldn't these be applicable to retaining walls also? Is crack control a serviceability concern or strength concern?