Swap Latin characters to Cyrillic lookalikes

CyrillicSwap.cs

public static void CyrillicSwap(string latinString)
{
    Console.OutputEncoding = Encoding.UTF8;
    Dictionary<string, string> CyrDict = new Dictionary<string, string>()
    {
        {"a", "а"}, // \u0430
        {"c", "с"}, // \u0441
        {"e", "е"}, // \u0435
        {"o", "о"}, // \u043e
        {"p", "р"}, // \u0440
        {"x", "х"}, // \u0445
        {"y", "у"}, // \u0443
        {"A", "А"}, // \u0410
        {"B", "В"}, // \u0412
        {"C", "С"}, // \u0421
        {"H", "Н"}, // \u041d
        {"E", "Е"}, // \u0415
        {"K", "К"}, // \u041a
        {"M", "М"}, // \u041c
        {"O", "О"}, // \u041e
        {"P", "Р"}  // \u0420
    };
    Random rand = new Random();
    StringBuilder str = new StringBuilder(latinString);
    foreach (KeyValuePair<string, string> r in CyrDict)
    {
        if (rand.Next(0, 2) == 0)
        {
            Console.WriteLine("Swapping {0}", r.Key);
            str.Replace(r.Key, r.Value);
        }
    }

    Console.WriteLine();
    Console.WriteLine("[+] Substitued Cyrillic Output:");
    Console.WriteLine("-------------------------------");
    Console.WriteLine(str);
}