Pitter Patter does pass its spots even in first generation...it just took a pollen dabber who decided to try it out even though others cast doubts on them. Here it was crossed with a split-color cultivar:
And, there are others already working on the 50% two-color splits, as well. You might be in good company, if you joined in with those pioneering spirits. It can be daunting for some to endlessly be told something is highly unlikely, but for others, the process of exploration and experimentation can be quite successful and enlightening!