The treadle is odd for the first hour, then you have absolutely no conscious knowledge that your foot is even on it and doing it's thing. I sure wouldn't let that have any weight on deciding. If your brain is unable to convert that treadle action to unconscious muscle memory in a very short time of use, you likely need to wear a helmet and carry a droll towel....
Getting used to it is no problem, getting used to being uncomfortable while using it is the problem!
I would skip any tractor that comes with a treadle pedal as I haven’t been on one from any manufacturer that doesn’t make me uncomfortable while using it.