It's really hard to say without knowing more. However, you are required to serve your pleading on your probation officer (so the idea that they're going to be "blindsided" in court is not accurate if you intend to play by the rules).
I would not tell your probation officer about it because it suggests you think you are special and merit different treatment.
Probation is a deal between you and the judge. The probation department administer the deal. I would simply file the motion. If the judge needs a probation officer's report, he or she will make the request.
I've got news for you - probation will know. The judge will seek input from probation re: your performance while on probation.
My thought is you're better off making nice with your PO and seeking their backup.
The above answer is for general information only and is based on the information you posted. Every case is fact dependent, so to get a thorough analysis of your situation, you will need to consult face to face with an attorney licensed to practice in the jurisdiction where the incident took place. Do not conclusively rely on any information posted online when deciding what to do about your case.