How to call function inside string

As far as I know, there’s no way for UDK to do that. I think you would have to make a list of all of your functions and make a big ugly switch statement:

function CallFunctionFromString(string FunctionName)
{
    switch(FunctionName)
    {
        case "Function1":
            Function1();
            return;
        case "Function2":
            Function2();
            return;
        case "Function3":
            Function3();
            return;
        ...
    }
}