Been there.
Since it's unlikely that you can get everything necessary before Tuesday, I'd say that you just plead your case on Tuesday and then set up appointments for your child to be evaluated.
Make sure that you tell the school that in the near future that you want a second meeting concerning the matter.

Thanks for the help. It was written in one of his Functional Behavior Assessments he cannot be alone so maybe that will help some. I will see how it goes. I am mostly comfortable with the smaller class he is in now, but it's not a permanent placement......

Before my son started middle school, I met with his new teacher and I told her that he would need an aide for the bathroom and P.E. It worked out because she told me that one of the paras would be with him. The same thing happened when he was going to start high school. I had a Zoom meeting with his teacher and explained his history of eloping and twice during PE class.
The para attends the general education (elective classes) with him. It’s not written in his IEP, but was documented in reports during his preschool
to elementary school years. What is written in the IEP is he needs extra time, sensory breaks, additional supports for the standardized tests.

I’m not sure how it will work across different states, I’m in IL. My son’s speech therapist at the school told me that the school never recommends a one-on-one aide but parents can be successful in advocating for one. I think the key will be what kind of supporting documentation you have to show the need for one. If you don’t have any documentation from a doctor, do you have anything in his therapy reports or previous reports from the school that you could use to support your claim? I’ve come to expect the bare minimum from public school and if I want anything extra I’ll need to fight for it or go to a private school and pay for it