Why would you need to think about anything other than diapers anyways? All those diaper thoughts are there to keep bad thoughts from leaking out. (Bad thoughts being literally any ones that aren't somehow about diapers, of course.)

(2/2) "I'm not allowed to bring it to school."
"I'm going to be completely honest, I'm running out of material here and starting to feel bad about this. You seem like you have enough problems."
"So, can I go now? I really want to get to the nurse before I end up with a rash again..."

A fate that has many wetting their diapers even at just the thought.

and have to use opposite gendered supplies in a pinch. Also, plain/medical default you to enby and there's the neutral option of "baby" too, I suppose? Just like... eh, who cares about norms you're too little to understand that anyhow, enjoy the cute pictures on your "underwear"!

Continuing on this, reality around you changes to the point where everyone sees you as undeniably whatever gender you currently are and just accepts that you're that now, but remembers you as your previous self too. Probably regret the no boys/girls allowed rule for your group when you run out-

I don't know where it comes from, because like, online doesn't have the excuse of my height/way I carry myself/anything like that. Here I'm literally just a small snuggly ball of fluff or maybe at most, the dorky kid that smells like pee >.>

Additional consideration:

Padded, cotton training undies. Possibly my favourite niche middle-space diaperkind. Enough to catch leaks, but will puddle if you're too late. Those must feel so good to hopelessly fill.