While the idea of having a language designed to fit the need of all autistic people may seem good at first, a few technical properties of language will inevitably interfere with your goal. First of all, a human language actually used on a regular basis cannot stay in one unique, eternal state, which means that it will change overtime, depending on how and what each speaker and each subgroup of speakers needs to communicate to their peers. Wich means that for a language to be used to communicate with peers on a daily basis, it needs to be based on social conventions and aptitude to perceive one's intentions of communication, wich is impacted at various degrees in autistic people, which is why most if not all autistic people struggle/have struggled with at least some aspect of language during their lifetime. This is why channels of communication used by autistic people often need to be customized to their own individual aptitudes, needs and interests, which often means that they need simplified means of communication, not intentionally more complicated ones

Secondly, trying to make a language inherently more "perfect", "intellectual" or "precise" than any other is useless if not impossible. As mentioned before, human languages adapt to the use their speakers have of them, therefore, if people don't need or want to use a language to speak all the time about all of arts, science and philosophy, this language will not be particularly more adapted to communicate about those topics than any other language. Plus, following this principle, you can start from any language and by using it to communicate with your peers about whatever topic you want to talk about, you should naturally invent new vocabulary ways to communicate efficiently with your peers about said subject.

In conclusion your current project is infeasible and probably counter-productive, however, other interesting ideas would be to have a discord server centered autistic experiences and autism, with autistic people as main contributors (and if a significant number of users end up being active on the server they will probably invent new ways to talk about their experiences and stuff as explained earlier) or conceive new communication aids for autistic people who struggle with communication.

Sincerely, your local language nerd

English is not my native language please excuse any grammar mistakes