The school my son attends allows for dual enrollment at the university. The head of the chem dept at the college told me personally that if my son is ready before he is tall enough, he will be set up at a wheel chair friendly station for labs. If the university doesn't see a problem with an 4' 8yo, you should be fine.

Shari
Mom to DS 10, DS 11, DS 13
Ability doesn't make us, Choices do!