As far as I know, one can not get the reduced cost of a variable that has been added to the LP-model before one has run optimize again.
I would like to see that being a possibility, as it can be useful for alot of users. I think one should be able to request duals, reduced costs etc, and then return the those values given the solution found the last time the model was solved.
I have seen that others have asked for such a feature ealier as well ( https://groups.google.com/g/gurobi/c/a5Fb7vv46gU ).
I hope you give it some thought!
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