What plan for Reconstruction would have worked?

It might have been helpful if you had outlined which aspects you deemed not to have worked. Taking a less liberal attitude to firearms might have helped, or there is the Trump approach of wall building

Ship all those Whites with right-wing opinions to Africa, especially to the Zulus, Ethiopia and Sudan.

Not assassinating Lincoln would have been a good start.. His replacement was incompetent.

Where, when?

Reconstruction of what? Your "buzzword" for your class only makes sense for your class. E.g., the Palace Grand Theatre was recently reconstructed in Dawson City, Yukon - successfully. However, most neither know, nor care about this.