Welcome! It looks like you've learned the first lesson that most OCDO members find out eventually: Asking law enforcement for legal advice usually doesn't do any good, as they are usually wrong. Sad, but true.
Anyway as far as open carry w/o a CHP, it is perfectly legal and there's no reason to be concerned. You will probably never have a problem with law enforcement. On the off chance that you get questioned, not having a CHP could even work to your favor. If they "suggest" that you simply conceal so you don't scare the sheeple, you can kindly inform them that you don't have a permit to do that . I often leave my CHP at home or in the car while I am open carrying for the same reason.
For openly carrying in your car, it can be done in a number of ways. It is widely understood that as long as the weapon is clearly visible in the vehicle, either on the dashboard or in the passenger seat, then it is not concealed. The theory is that someone (normally a cop) should be able to clearly see the weapon while looking through the window.
Some also believe that a weapon, holstered on your hip, is not concealed even if you're sitting in your car. The theory here is that if you're openly carrying, and you sit down in a chair with arms, your gun may be covered, but that doesn't mean you're concealing the weapon. This should also apply to your vehicle, since by sitting in your car you're not intentionally concealing the gun. Rather, it's simply not visible since you're sitting down.
What I suggest to those w/o a CHP is that they leave the gun in their holster. If the unlikely happens and you get pulled over, simply move the gun to the passenger seat before you stop. This is what I have done in the past, and there was plenty of time to move it while I pulled off the road. The only thing you want to avoid is having the gun in your hand after the LEO is out of his car. I don't need to tell you why that would be a bad idea .
Keep in mind, I'm not a lawyer, but this is the advice and information that I live by.