I think both styles are nice. I'm leaning towards centering. I have no idea what to do with the pantry though

The designer I work with wanted just one at the top of of door but kiddos can't reach that so she put another one lower. I was thinking of just one about 50" off floor, like a fridge handle height and it could be 9" instead of 5".

Use one larger pull for the pantry - appliance size would work. Two looks odd, if not silly.

I think you're right. So a 9" pull would be sufficient, centered in the middle of panel, like so. Alternatively I could align with the top of the fridge handles at 55"

I think that looks much better and proper scale.

I like using the same offset on all drawers instead of centered but either one is acceptable

From the looks of it the pantry has to taller cabinets? I would try to get two longer pulls so that when your smaller children are trying to open them they are not pulling down on the hardware and putting unnecessary stress on the door and hardware.
If you can’t get a longer handle look at getting a very slim pull,that attaches to the bottom of the cabinet door that your children could use. (They have a very slim profile usually used in modern kitchens. Sorry not sure of the particular name)

We have knobs on uppers, and pulls on lowers - using the same non-centered method you describe. Here is the pantry:

In our last house, we placed the knobs on the top of the pantry cabs too, and liked the fact that our little one could NOT reach them.