You're not alone.
DS is 6 and has made progress in the last year.
He will stand up to do a wee, but he wont always tell us he needs a wee, and won't independently take himself to the toilet.
He will only do a wee if the toilet is within eye sight when he need to go, otherwise he will just wee in his pants.
We can't transition from pull ups though as he withholds his poo. He will only do a poo in a pull up, and when he does do a poo he's like a ninja, its so fast, there's no opportunity to get him into the bathroom.
Changing him in the bathroom to create associations hasn't worked. Emptying the poo into the toilet from his pull ups doesn't work. He will just not sit on a toilet seat at all, whether it's bare, padded, or has one of those ugly toilet seat covers on.
Annoyingly, because his classroom has young child accessible toilets literally right there where he can see them, he takes himself off for a wee most of the time, but that will change this week when he enters a new classroom, so it's been really hard to gather evidence for his DLA about his toileting needs, because it's entirely environmentally dependent and that classroom was clearly the right environment.
What helped us get him to wee in the toilet is categorically disgusting on every level, and I can't believe I'm about to put this in writing on the Internet and I'm not even name changing, but: his dad and I would draw a target in the toilet bowl with whiteboard pen and I would use a sports bottle of water and he would be in the bathroom while his dad and I would play who could wash the target off first. His dad was team yellow 🤢🤮, and I was team white, and every time I would lose on purpose.
For a few weeks he was so disinterested, but we did it anyway, and we would make a huge song and dance and act competitive and I would act gutted and his dad would be jumping with joy. After a few weeks he decided he wanted to squirt my sports bottle with me but I'd sabotage it and lose anyway, and a few weeks after that his dad stopped playing and I got him to join in and be team yellow 🤮🤢🤮🤢🤮🤢🤮🤢, but then he just carried on after that having a wee in the toilet whenever I took him in.
It's really important for my sanity that anybody reading this understands that before this we had tried absolutely everything and I'd already sat through 2 ERIC webinars one being special needs oriented, been under the HV team, been through the incontinence team, spent a fortune on various shapes and sizes of potty, tried praise, tried charts, had a bribery sweet jar stationed right outside the toilet, sat and modelled having a wee or a poo whilst narrating audibly for all in the house to hear "I'm going to the toilet to have a poo" "I'm sitting on the toilet to have a poo" "I am pooing on the toilet" "I have had a poo on the toilet and now I'm going to wipe my bum".
We didn't force it multiple times a day, maybe once or twice and some days we even skipped it because we were deflated and not getting anywhere but I think the relaxation on not pushing it is what helped his interest pique in the end.